Physics Preliminary Module 8.3 Electrical Energy in ... - HSCPhysics

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Oct 7, 2013 (4 years and 1 month ago)

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HSC Physics

Module 8.3




Electrical
Energy in the
Home


Physics


Preliminary


Module 8.3 Electrical Energy in the Home


Teaching Program


2

8.3

Electrical Energy in the Home (30 indicative hours)


Contextual Outline


Electricity is an essential energy source for modern living. Disruption to supply or isolation can lead to the
develo
pment of alternative methods of obtaining this essential energy resource. For electrical energy to be
useful it must be harnessed through the use of an electrical circuit and an energy
-
converting appliance.


As electricity became increasingly used as the m
ain power supply in homes and electrical appliances became
an integral part of daily life for many Australians, the dangers associated with electricity became more
prominent. Voltages as low as 20 volts can be dangerous to the human body depending on the h
ealth of the
person and length of time of contact with the current. Safety devices in household appliances and within the
electric circuits in the home can prevent electrical injury or assist in reducing the potential for electric shock.


This module incre
ases students’ understanding of the history, nature and practice of physics and the
applications and uses of physics.


Assumed Knowledge

Domain: knowledge and understanding:


Refer to the Science Stages 4

5 Syllabus for the following:

5.6.3a

design, constr
uct and draw circuits containing a number of components

5.6.3b

describe voltage, resistance and current using analogies

5.6.3c

describe qualitatively, the relationship between voltage, resistance and current

5.6.3d

compare advantages and disadvantages of s
eries and parallel circuits



Skills


Skill development focuses on:



Developing scientific research and communication skills in extracting information, drawing and writing
effectively.



Planning and carrying out procedures to obtain first hand data.



Develop
ing skills in manipulating a variety of electrical components and measuring devices.



Developing skills in analysing information to identify patterns and trends and to use models to explain
phenomena or to make predictions.


Values and Attitudes


During th
is module, teaching/learning activities should allow students to reflect on personal and societal
choices and responsibilities about energy production and consumption. There should be an enhanced
understanding of the impacts of the provision of electrical
energy on the environments from which the
necessary resources are obtained and those environments in which electrical generation and transmission
occur. Often the decisions Governments make are compromises e.g. coal mining is allowed if associated with
co
nservation projects and these issues could provide opportunities for class debate.


Students should be provided with opportunities to develop a better understanding of the need to provide a
balance between the electrical energy needs of people and limited
resources available to produce that energy.
The importance of research into renewable, low impact sources of energy should be raised. They should also
appreciate the imbalance that occurs across and between societies in the availability and consumption of
electrical energy.


Open class discussions centred round Gospel values should challenge the students to formulate their own
opinions about equity, conservation and respect for the opinions of others.


Physics


Preliminary


Module 8.3 Electrical Energy in the Home


Teaching Program


3

Concept Map







CHARGE









HISTORICAL


ST
ATIC




DEVELOPMENT


ELECTRICITY




ELECTRIC



POTENTIAL



CURRENT

FIELDS




DIFFERENCE



ELECTRICITY











AC/DC



















RESISTANCE


SOURCES

OF PD



CIRCUITS









APPLICATIONS &







TECHNOLOGY




SAFETY





HO
USEHOLD



ENERGY






ELECTRICITY



CONSUMPTION



Physics


Preliminary


Module 8.3 Electrical Energy in the Home


Teaching Program


4


Electrical Energy in the Home Module Plan


Module Length: 7 weeks


Focus Area

Time

Concept

Resources

Practical

1. Society has
become
increasingly
dependent on
electricity over
the last 200 years

1

1

di
scuss how the main
sources of domestic power
have changed over time

2

assess some of the
impacts of changes in, and
increased access to,
sources of power for a
community

3 discuss some of the ways
in which electricity can be
provided in remote
locatio
ns

UP: 149

NS: The EM
link

Contexts I:
pp. 257
-
277

1

(Act 1)
identify data sources,

gather, process and analyse
secondary information about the
differing views of Volta and Galvani
about animal and chemical electricity
and discuss whether their differen
t
views contributed to increased
understanding of electricity.

2. One of the main
advantages of
electricity is that
is can be moved
with comparative
ease from one
place to another
through electric
circuits

1

1

describe the behaviour of
electrostatic charg
es and the
properties of the fields
associated with them

2

define the unit of electric
charge as the coulomb

3

define the electric field as a
field of force with a field
strength equal to the force
per unit charge at that point


UP:
149
-
159

Contexts I:
pp. 211
-
221
Dyett: 90
-
116

Humphrey’s
Set 36

1

(Exp 2)
present diagrammatic
information to describe the electric
field strength and direction:



between charged parallel plates.



about and between a positive and
negative point charge

2

(Act 3)
solve problems and analyse
information using E = F /q

2

4 define electric current as the
rate at which charge flows
(coulombs/second or amperes)

5

identify that current can be
either direct with the net flow
of charge carriers moving in
one dir
ection or alternating
with the charge carriers
moving backwards and
forwards periodically

UP: 173
-
182

Contexts I:
pp. 211
-
221
Dyett: 117
-
119

Humphrey’s
Sets 37
-
38

3

(Exp 4)
plan, choose equipment for
and perform a first
-
hand investigation
to gather data a
nd use the available
evidence to show the relationship
between voltage across and current in
a DC circuit.



2

6 describe electric potential
difference (voltage) between
two points as the change in
potential energy per unit
charge moving from one point
t
o the
other (joules/coulomb or
volts)

7 discuss how potential
difference changes at different
points around a DC circuit

UP: 159
-
173

Contexts I:
pp. 211
-
221
Dyett: 126
-
133

4

(Exp 5)
plan, choose equipment for
and perform a first
-
hand investigation
to gath
er data and use the available
evidence to show the variations in and
potential difference between different
points around a circuit


Physics


Preliminary


Module 8.3 Electrical Energy in the Home


Teaching Program


5

Focus Area

Time

Concept

Resources

Practical

2

8 describe the difference
between conductors and
insulators

9 Define resistance as the ratio
of voltage to current fo
r a
particular conductor


10 explain qualitatively and
quantitatively that resistance is
related to potential difference

11 describe qualitatively how
each of the following affects
the movement of electricity
through a conductor:




length




cross sectional area




temperature




material

UP: 185
-
7

Contexts I:
pp. 229
-
233

5

(Act 6)
gather and process secondary
information to identify materials that
are commonly used as conductors to
provide household electricity



3. Series and
pa
rallel circuits
serve different
purposes

in households

3

1 identify the difference between
series and parallel circuits.

2 compare parallel and series
circuits in terms of voltage
across components and
current through them

3 identify the uses of ammeters
and voltmeters

4 explain why ammeters and
voltmeters are connected
differently in a circuit

5 explain why there are different
circuits for lighting, heating and
other appliances in a house


UP: 187
-
199

Contexts I:
pp. 234
-
240
Dyett: 120
-
138

Humphrey
Sets
39
-
40

1

(Exp 7)
plan, choose equipment or
resources for and perform first
-
hand
investigations to gather data and use
available evidence to compare
measurements of current and voltage
in series and parallel
circuits in
computer simulations

or hands
-
on
equip
ment

2

(Exp 8)
plan, choose equipment or
resources for process information and
perform a first hand investigation to
construct a simple model household
circuits using electrical components

4. The amount of
energy
transformed in an
appliance is
related to
the
power rating of an
appliance and the
length of time it is
used

3

1

explain that power is the
rate at which energy

is transformed from one

form to another

2

identify the relationship
between power dissipated,
potential difference and
current

3

identify

that the total
amount of energy used
depends on the length of
time the current is flowing
and can be calculated
using: Energy = VIt

4

explain why the kilowatt
-
hour is used to measure
domestic electricity
consumption rather than
the joule

UP: 193
-
99

Conte
xts I:
pp. 262
-
266
Humphrey
Set 42

1

(Exp 9)
perform a first
-
hand
investigation, gather information and
use available evidence to
demonstrate the relationship between
current,
voltage and power for a model

6V to 12V electric heating coil

2

(Act 10)
solve

problems and analyse
information using


P=VI and Energy = VIt


Physics


Preliminary


Module 8.3 Electrical Energy in the Home


Teaching Program


6

Focus Area

Time

Concept

Resources

Practical

5. Electric currents
also produce
magnetic fields
and these fields
are used in
different devices
in the home

3

1

describe the behaviour of
the magnetic poles of bar
magnets when they are
bro
ught close together

2

define the direction of the
magnetic field at a point as
the direction of force on a
very small north magnetic
pole when placed at that
point

3

describe the magnetic field
around pairs of magnetic
poles


UP: 201
-
211

Contexts I:
pp.
241
-
249
Dyett: 139
-
140

1

(Exp 11)
plan, choose equipment or
resources for, and perform a first
-
hand investigation build an
electromagnet

2

(Exp 12)
perform a first
-
hand
investigation to observe magnetic
fields by mapping lines of force:




around a bar mag
net




surrounding a straight


DC current
-
carrying
conductor




a solenoid


present information using


and




to show the di recti on of a current and
di recti on of a magneti c fi el d.

3

4

descri be the producti on of
a magneti c fi el d by an
el ect
ri c current i n a strai ght
current
-
carryi ng conductor
and descri be how the ri ght
hand gri p rul e can
determi ne the di recti on of
current and fi el d l i nes

5

compare the nature and
generati on of magneti c
fi el ds
by solenoids and a bar
magnet


UP: 207
-
211
Dyett: 1
46
-
53

Humphrey
Set 45

3

(Act 13)
identify data sources, gather,
process and analyse information to
explain one application of magnetic
fields in household appliances.

6. Safety devices
are important in
household
circuits

3

1

discuss the dangers of an
elec
tric shock from both a
240 volt AC mains supply

and various DC voltages,
from appliances, on the
muscles of the body

2

describe the functions of
circuit breakers, fuses,
earthing, double insulation
and other safety devices in
the home

Contexts I:
pp. 27
8
-
283



Physics


Preliminary


Module 8.3 Electrical Energy in the Home


Teaching Program


7

Preliminary Physics C2: Electrical Energy in the Home Activity 1: History of Electricity


Aim: To identify data sources, gather, process and analyse secondary information about the differing views
of Volta and Galvani about animal and chemical el
ectricity and discuss whether their different views
contributed to increased understanding of electricity.


Outcomes Assessed

o

accessing information from a range of resources, including popular scientific journals, digital
technologies and the Internet (12.
3a)

o

practising efficient data collection techniques to identify useful information in secondary sources (12.3b)

o

summarising and collating information from a range of resources (12.3d)

o

identifying practising male and female Australian scientists, and the ar
eas in which they are currently
working and in formation about their research (12.3e)

o

evaluate the validity of first
-
hand and secondary information and data in relation to the area of
investigation (12.4d)

o

assess the reliability of first
-
hand and secondary

information and data by considering information from
various sources (12.4e)

o

selecting and using appropriate text types or combinations thereof, for oral and written presentations
(13.1a)

o

selecting and using appropriate methods to acknowledge sources of i
nformation (13.1c)


Write a 400 word report on this dot point.


Preliminary Physics C2: Electrical Energy in the Home Experiment 2: Mapping Equipotential
Lines


Aim: To present diagrammatic information to describe the electric field strength and direction
between charged parallel
plates and about and between a positive and negative charge.


Outcomes Assessed

o

using symbols and formulae to express relationships and using appropriate units for physical quantities
(13.1d)

o

using a variety of pictorial representa
tions to show relationships and present information clearly and
succinctly (13.1e)

o

selecting and drawing appropriate graphs to convey information and relationships clearly and
accurately (13.1f)


Physics


Preliminary


Module 8.3 Electrical Energy in the Home


Teaching Program


8

Method

1. The diagram on the rig
ht is set up.

2. Using the probe, trace a line along the paper where the voltage
remains the same. Mark this line using a lead pencil. ENSURE
THAT THE PAPER STAYS WET AT ALL TIMES!

3. Repeat steps 1 and 2 until several equipotential lines (8) are
drawn. Re
cord the voltage of each line.

4. Repeat steps 1
-
3 for the electrodes shown below:



















Discussion

(1) How can we find the electric field from the equipotential lines? Draw the electric field for each pair of
electr
odes.

(2) What is the purpose of the salt solution?

(3) Suggest what happens on the inside of the circle in electrode pairs 3 & 5

(4) What does your answer to (3) tell you about how charge is conducted?

(5) What industrial applications could there be for y
our answers to questions (3) and (4)?

(6) Calculate the value of the electric field in each case that you studied.

(7) What is charge? (No textbook definitions please, just your own ideas about what charge is.)






Preliminary Physics C2: Electrical Energ
y in the Home Activity 3: Electric Fields


Aim: To solve problems and analyse information using E = F /q


Outcomes Assessed

o

identify trends, patterns and relationships as well as contradictions in data and information (14.1a)

o

identify and explain how data

supports or refutes an hypothesis, a prediction or a proposed solution to
a problem (14.1c)

o

use models, including mathematical ones, to explain phenomena and/or make predictions (14.1f)

o

design and produce creative solutions to problems (14.3a)

o

propose ide
as that demonstrate coherence and logical progression and include correct use of scientific
principles and ideas (14.3b)

o

apply critical thinking in the consideration of predictions, hypotheses and the results of investigations
(14.3c)



Physics


Preliminary


Module 8.3 Electrical Energy in the Home


Teaching Program


9

o

Formulate cause and e
ffect relationships (14.3d)


Do Humphrey’s Set 36



Physics


Preliminary


Module 8.3 Electrical Energy in the Home


Teaching Program


10

Preliminary Physics C2: Electrical Energy in the Home Experiment 4: DC Circuits.


Aim: To plan, choose equipment for and perform a first
-
hand investigation to gather data and use the available
evidence
to show the relationship between voltage across and current in a DC circuit.


Outcomes Assessed

o

demonstrate the use of the terms ‘dependent‘ and ‘independent‘ to describe variables involved in the
investigation (11.2a)

o

identify variables that needed to be
kept constant, develop strategies to ensure that these variables
are kept constant, and demonstrate the use of a control (11.2b)

o

design investigations that allow valid and reliable data and information to be collected (11.2c)

o

describe and trial procedures
to undertake investigations and explain why a procedure, a sequence of
procedures or the repetition of procedures is appropriate (11.2d)

o

identifying and/or setting up the most appropriate equipment or combination of equipment needed to
undertake the invest
igation (11.3a)

o

carrying out a risk assessment of intended experimental procedures and identifying and addressing
potential hazards (11.3b)

o

carrying out the planned procedure, recognising where and when modifications are needed and
analysing the effect of
these adjustments (12.1a)

o

identifying and using safe work practices during investigations (12.1d


Part A: CRO

Both types of current will be displayed on the CRO.


Part B: Circuit

1. Set up the circuit on the right. Set the power supply to 12V DC.


1.

Measu
re the voltage and current through the resistor at several different settings of the rheostat.


Discussion

(1)

Does a resistor treat AC different from DC? Explain your answer.

(2)

Why is DC more useful for circuits?

(3)

Explain the following terms: transformer, rect
ifier, bridge circuit.




Physics


Preliminary


Module 8.3 Electrical Energy in the Home


Teaching Program


11

Preliminary Physics C2: Electrical Energy in the Home Experiment 5: Voltage


Aim: To plan, choose equipment for and perform a first
-
hand investigation to gather data and use the available
evidence to show the variations in and po
tential difference between different points around a circuit


Outcomes Assessed

o

demonstrate the use of the terms ‘dependent‘ and ‘independent‘ to describe variables involved in the
investigation (11.2a)

o

identify variables that needed to be kept constant, d
evelop strategies to ensure that these variables
are kept constant, and demonstrate the use of a control (11.2b)

o

design investigations that allow valid and reliable data and information to be collected (11.2c)

o

describe and trial procedures to undertake inv
estigations and explain why a procedure, a sequence of
procedures or the repetition of procedures is appropriate (11.2d)

o

identifying and/or setting up the most appropriate equipment or combination of equipment needed to
undertake the investigation (11.3a)

o

carrying out a risk assessment of intended experimental procedures and identifying and addressing
potential hazards (11.3b)

o

carrying out the planned procedure, recognising where and when modifications are needed and
analysing the effect of these adjustment
s (12.1a)

o

identifying and using safe work practices during investigations (12.1d


Method

1.

Set up the following circuit:


2.

Measure the voltage between different points as given in the results table.


Results Table

Voltage
between

a

b

c

d

e

f

g

h

a









b









c









d









e









f









g









h











Discussion

(1)

Is there more than 12V in the circuit? Why ? why not?

(2)

Why is there no potential difference between points a and c?

(3)

What is the voltage across the switch when it is o
pen? Explain your answer.

Physics


Preliminary


Module 8.3 Electrical Energy in the Home


Teaching Program


12




Physics


Preliminary


Module 8.3 Electrical Energy in the Home


Teaching Program


13

Preliminary Physics C2: Electrical Energy in the Home Activity 6: Conductors


Aim: To gather and process secondary information to identify materials that are commonly used as conductors to
provide household electricity


Outc
omes Assessed

o

accessing information from a range of resources, including popular scientific journals, digital technologies
and the Internet (12.3a)

o

extracting information from numerical data in graphs and tables as well as written and spoken material in
al
l its forms (12.3c)

o

summarising and collating information from a range of resources (12.3d)

o

identifying practising male and female Australian scientists, and the areas in which they are currently
working and in formation about their research (12.3e)

o

identi
fy and apply appropriate mathematical formulae and concepts (12.4b)

o

evaluate the validity of first
-
hand and secondary information and data in relation to the area of investigation
(12.4d)

o

assess the reliability of first
-
hand and secondary information and d
ata by considering information from
various sources (12.4e)

o

assess the accuracy of scientific information presented in mass media by comparison with similar
information presented in scientific journals (12.4f)

o

selecting and using appropriate methods to ack
nowledge sources of information (13.1c)


Write a 300 word report identifying commonly used conductors for household electricity.

Physics


Preliminary


Module 8.3 Electrical Energy in the Home


Teaching Program


14

Preliminary Physics C2: Electrical Energy in the Home Experiment 7: Series & Parallel.


Aim: To plan, choose equipment or reso
urces for and perform first
-
hand investigations to gather data and use
available evidence to compare measurements of current and voltage in series and parallel circuits in
computer simulations or hands
-
on equipment


Outcomes Assessed



You must devise a me
thod using equipment listed below and/or any other reasonable equipment.

Equipment Available

Ammeters & voltmeters

Resistors, wires

Power supply

Computer with Crocodile Clips installed.


You should consider the following points:



Does the experiment satisfy

the aim above?



The safety of the experiment. Any safety notes need to be explicit.



Design your own result table. Have you repeated the experiment several times to validate the results and to
calculate a mean?



Did you show your working?



What are some pos
sible sources of error? How could these errors be minimised or eliminated?


Physics


Preliminary


Module 8.3 Electrical Energy in the Home


Teaching Program


15

Preliminary Physics C2: Electrical Energy in the Home Experiment 8: Modelling Household
Circuits.


Aim: To plan, choose equipment or resources for process information and perform

a first hand investigation to construct
model household circuits using electrical components


Outcomes Assessed

o

describe and trial procedures to undertake investigations and explain why a procedure, a sequence of
procedures or the repetition of procedures

is appropriate (11.2d)

o

identifying and/or setting up the most appropriate equipment or combination of equipment needed to
undertake the investigation (11.3a)

o

carrying out a risk assessment of intended experimental procedures and identifying and addressing

potential hazards (11.3b)

o

carrying out the planned procedure, recognising where and when modifications are needed and
analysing the effect of these adjustments (12.1a)

o

identifying and using safe work practices during investigations (12.1d)


You must devis
e a method using equipment listed below and/or any other reasonable equipment.


Make circuits that represent the following:

Double pole light switch

Electric kettle

Electric blanket (with three heat settings)

For each situation, construct and draw a circui
t that satisfies the situation. Put at least one resistor in series with
the power supply.


Equipment Available

Ammeters & voltmeters

Resistors, wires

Power supply


You should consider the following points:



Does the experiment satisfy the aim above?



The s
afety of the experiment. Any safety notes need to be explicit.



Design your own result table. Have you repeated the experiment several times to validate the results and to
calculate a mean?



Did you show your working?



What are some possible sources of erro
r? How could these errors be minimised or eliminated?

Physics


Preliminary


Module 8.3 Electrical Energy in the Home


Teaching Program


16


Preliminary Physics C2: Electrical Energy in the Home Experiment 9: Heating Coils


Aim: To perform a first
-
hand investigation, gather information and use available evidence to demonstrate the
relatio
nship between current, voltage and power for a model 6V to 12V electric heating coil


Outcomes Assessed

o

carrying out the planned procedure, recognising where and when modifications are needed and
analysing the effect of these adjustments (12.1a)

o

identifyin
g and using safe work practices during investigations (12.1d)

o

using symbols and formulae to express relationships and using appropriate units for physical quantities
(13.1d)

o

using a variety of pictorial representations to show relationships and present inf
ormation clearly and
succinctly (13.1e)

o

selecting and drawing appropriate graphs to convey information and relationships clearly and
accurately (13.1f


Method

1.

Set up the circuit shown below:





Heating Coil

12V

V





A


2.

Measure the mass o
f water in a beaker. (the coil may already have a container)

3.

Immerse the heating coil in the beaker of water

4.

Measure the initial temperature of the water.

5.

Turn the power on and measure the time it takes for the water heat up by 10°C.


Discussion

1.

Calculate

the power rating of the heating coil.

2.

Calculate the energy delivered to the coil.

3.

Using the equation

H=mc.

T where c


4.182 J/g/K for water, calculate the heat energy given to the
water.


Preliminary Physics C2: Electrical Energy in the Home Activity 10
: Power and Energy


Aim: To solve problems and analyse information using P=VI and Energy = VIt for a variety of situations


Outcomes Assessed

o

identify trends, patterns and relationships as well as contradictions in data and information (14.1a)

o

identify an
d explain how data supports or refutes an hypothesis, a prediction or a proposed solution to
a problem (14.1c)

o

use models, including mathematical ones, to explain phenomena and/or make predictions (14.1f)

o

design and produce creative solutions to problems (
14.3a)

o

propose ideas that demonstrate coherence and logical progression and include correct use of scientific
principles and ideas (14.3b)

o

apply critical thinking in the consideration of predictions, hypotheses and the results of investigations
(14.3c)

o

fo
rmulate cause and effect relationships (14.3d)

Physics


Preliminary


Module 8.3 Electrical Energy in the Home


Teaching Program


17


Do Humphrey’s Set 42



Physics


Preliminary


Module 8.3 Electrical Energy in the Home


Teaching Program


18

Preliminary Physics C2: Electrical Energy in the Home Experiment 11: Electromagnets


Aim: To plan, choose equipment or resources for, and perform a first
-
hand investigation to build an

electromagnet


Outcomes Assessed

o

carrying out the planned procedure, recognising where and when modifications are needed and
analysing the effect of these adjustments (12.1a)

o

identifying and using safe work practices during investigations (12.1d)


You mus
t devise a method using equipment available in the laboratory. You should consider the following points:




Does the experiment satisfy the aim above?



The safety of the experiment. Any safety notes need to be explicit.



Design your own result table. Have y
ou repeated the experiment several times to validate the results and to
calculate a mean?



Did you show your working?



What are some possible sources of error? How could these errors be minimised or eliminated?



Do you have a conclusion?


After your results,

you should provide a detailed discussion of the implications of the experiment.

Physics


Preliminary


Module 8.3 Electrical Energy in the Home


Teaching Program


19

Preliminary Physics C2: Electrical Energy in the Home Experiment 12: Mapping Magnetic
Fields


Aim: To perform a first
-
hand investigation to observe magnetic fields by mapping

lines of force around a bar magnet;
surrounding a straight DC current
-
carrying conductor; and of a solenoid and present information using


or • to show
the direction of a current and strength and direction of a magnetic field.


Outcomes Assessed

o

carry
ing out the planned procedure, recognising where and when modifications are needed and
analysing the effect of these adjustments (12.1a)

o

identifying and using safe work practices during investigations (12.1d)


Method

Part A: Mapping Magnetic Fields Around
a Bar Magnet

1. Obtain two bar magnets, a plastic sheet and some iron filings.

2. Arrange the bar magnets such that two opposite poles are facing each other and are seperated by about 1 cm. Lay
the plastic sheet over the magnets and gently sprinkle the iro
n filings over the magnets.

3. Record the pattern produced in your prac books.

4. Reverse the pole on one of the magnets. Repeat the procedure.


Part B: Mapping Magnetic Fields Around a Current
-
Carrying Conductor

1.

Wrap a wire in a plastic bag.

2.

Pierce a hole

in the middle of a large piece of cardboard.

3.

Thread the wire through the hole in the cardboard.

4.

Suspend the wire vertically so that the cardboard is horizontal.

5.

Connect the wire to a power supply.

6.

Sprinkle the iron filings around the cardboard.

7.

Draw the p
attern observed.


Part C: Mapping Magnetic Fields Around a Solenoid

Repeat part A using a single solenoid instead of the bar magnets.


Discussion

(1) What are some examples of magnetic materials? What do they have in common?

(2) On the molecular level, wha
t is a ferromagnet? How is this different to diamagnetism?

(3) What is anti
-
ferromagnetism? Explain using diagrams.

(4) What is the convention for the direction of magnetic fields?

(5) How are magnetic fields and electric fields related?







Physics


Preliminary


Module 8.3 Electrical Energy in the Home


Teaching Program


20

Preliminary

Physics C2: Electrical Energy in the Home Activity 13: Household Appliances


Aim: To identify data sources, gather, process and analyse information to explain one application of magnetic fields in
household appliance.


Outcomes Assessed

o

accessing informat
ion from a range of resources, including popular scientific journals, digital
technologies and the Internet (12.3a)

o

extracting information from numerical data in graphs and tables as well as written and spoken material
in all its forms (12.3c)

o

summarising
and collating information from a range of resources (12.3d)

o

identifying practising male and female Australian scientists, and the areas in which they are currently
working and in formation about their research (12.3e)

o

identify and apply appropriate mathema
tical formulae and concepts (12.4b)

o

evaluate the validity of first
-
hand and secondary information and data in relation to the area of
investigation (12.4d)

o

assess the reliability of first
-
hand and secondary information and data by considering information f
rom
various sources (12.4e)

o

assess the accuracy of scientific information presented in mass media by comparison with similar
information presented in scientific journals (12.4f)

o

selecting and using appropriate methods to acknowledge sources of information
(13.1c)



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