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
his reading?
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)
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