# Name the following circuit symbols: - recursostecno

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7 Οκτ 2013 (πριν από 4 χρόνια και 9 μήνες)

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Differences between AC and DC

(sheet given)

Table explaining the differences/rules between series circuits and parallel circuits.

(sheet given)

Explica brevemente que las 3 magnitudes básicas, indicando como se simbolizan cada
una y en que unidades se mi
de.

Complete the following sentences:

a. The force that is applied to a conductor to cause a current to flow is
_________
_______________

b. With an increase of length or a decrease of cross
-
section of a conductor the
resistance
______________
____________
____

c. Current must always be expressed in
_______________

_________________

d. The total current of a simple circuit with a voltage supply of 12 volts and a resistance of 24

ohms
_
is
______________

e. When you have three bulbs connected in series, the same
______________

will flow

through all of them.

f. When a lamp breaks

and others continue working, they are connected in
__________

Name the following
circ
u
i
t symbols:

Draw the electric diagram of an electric circuit that consists of three

bulbs:

-

co
nnected in series. If one bulb is blown, what will happen?

-

connected in parallel. If one bulb is blown, what will happen?

Workout the equivalent resistance

In the next exercises, batteries have equal values of 5 volts. Which circui
t has the
brighter globe, a or b? Why?
What happens in c and d?

True or false?

-

A voltimeter is connected in series to measure the voltage across a

component in a circuit.

-

An ammeter is connected in series to measure the current flowing

through a component in a circuit.

-

An
ohmmeter is connected in parallel and with voltage to measure

the resistance of a resistor.

-

The connection of a multimeter depends on what electrical

magnitude it measures.

Complete the sentences:

-

To increase the current without modifying the voltage

we

must_________________.

-

To decrease the current without modifying the voltage we

must_________________.

-

To increase the current without modifying the resistance we

must_________________.

-

To decrease the current without modifying the resistance we

must_________________.

1. Resistance in a circuit is generally measured in units of ____.

A. W

B. Õ

C. K

D. Z

2. Which of the following is the correct expression of Ohm's Law?

A. I = R/V

B. R= P/V

C. I= P/V

D. I = V/R

13. If a 15
-
ohm resistor
is connected in parallel with a 30 ohm
-
resistor, the equivalent
resistance is?

A. 5

B. 7

C. 10

D. 15

What device is used to convert
alternating
current to
direct

current?

ı
Q: Holding resistance constant, how does increasing current in a circuit

a
ffect voltage?

ı
Q: How would adding a 20
-
&
resistor in parallel with a 100
-
&
resistor

change the reading on an ammeter?

Q: When measuring DC voltage across a device with a multimeter, the

meter indicates 0 volts. What is one possible explanation for t

Q: How should a multimeter’s leads be connected when measuring

resistance?

If a resistor suddenly decreases in value (resistance decreases), what will
happen to the

current through the resistor?

a. increases

b. remains unchanged

c. decrea
ses

d. fluctuates

Which of the following is an appropriate use for a voltmeter?

a. To measure difference of potential

b. To measure current flow

c. To determine total resistance

d. To determine power output

2.
Calculate the
R
eq
. Draw all the interme
dia
te circuits.

3. In this circuit, c
alculate the
R
eq
, I
T
, V
1
, V
2
.

4. In the following circuit find: R
eq
, I
T
, I
1
, I
2
,
I
3
.

Put the following sentences in order.

a. Plugs are connected to an electric grid

b. An electric grid carrie
s the electricity produced in Power Electric

stations.

c. Electricity is produced in Power Electric Stations.

d. Televisions must be plugged in to work

e. Televisions need electricity to work.

Fill the gaps with the words given:

Voltage, Current, Resista
nce


________ is the number of electrons that pass through an electric

circuit every second.


The opposition that some materials offer to the movement of

electrical current is called ________.


___________ is the energy given to electrons to pass th
rough a

circuit.

Underline what you think is the most suitable word:


The thicker and shorter a wire is the more/less resistance it has.


The thinner and longer a wire is the more/less resistance it has.

What operation must you do in every case?

I
f I do not know…


the current I must____________ (multiply / divide) ___________

(voltage /current /resistance) by ___________ (voltage / current /

resistance)


the voltage I must ____________ (multiply / divide) ___________

(voltage /current /resista
nce) by ___________ (voltage / current /

resistance)


the resistance I must ____________ (multiply / divide)

___________ (voltage /current /resistance) by ___________

(voltage / current / resistance)