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WorksheetsElectricity revision
Total questions: 35
Worksheet time: 41mins
Name
Class
Date
1.
what is this symbol for?
a)
light bulb
b)
cell
c)
battery
d)
resistor
2.
This is the circuit symbol for ...
a)
an AC current source
b)
a DC current source
c)
an ammeter
d)
a voltmeter
3.
This is the circuit symbol for ...
a)
an AC current source
b)
a DC current source
c)
an ammeter
d)
a voltmeter
4.
What kind of circuit is this?
a)
Series
b)
Consecutive
c)
Parallel
d)
Training
5.
What kind of circuit is this?
a)
Series
b)
Consecutive
c)
Parallel
d)
Training
6.
The picture shows an electrical circuit. This circuit is a series circuit because:
a)
It has 3 light bulbs.
b)
The same current flows through all three light bulbs.
c)
It uses a single battery.
d)
The electrical current is divided between the three light bulbs.
7.
Current is measured in....
a)
Amps
b)
Volts
c)
Ohms
d)
Coulombs
8.
What 'flows' in a wire?
a)
Protons
b)
Neutrons
c)
Atoms
d)
Electrons
9.
What would the voltmeter read
a)
1V
b)
2V
c)
3V
d)
6V
10.
Which Voltmeter will give the lowest reading?
a)
V1
b)
V2
c)
V3
11.
Correctly identify component A, B and C
a)
A = Switch, B= Cell, C= LDR
b)
A= Cell, B= Switch, C= Diode
c)
A= Switch, B= Lamp, C= Diode
d)
A= Switch, B= Cell, C= Diode
12.
What does a fuse do?
a)
Die
b)
Makes sure the volts don't go over a certain point.
c)
Has fun
d)
Give out energy
13.
Which best describes a parallel circuit?
a)
Electricity flows along one pathway.
b)
The flow of electricity comes from one source.
c)
Electricity flows along more than one pathway.
d)
The flow of electricity comes from more than one source.
14.
What 'flows' in a wire?
a)
Protons
b)
Neutrons
c)
Atoms
d)
Electrons
15.
A Charging system producing 14.5 Volts with a current flow of 43.5 Amps, what is the circuit resistance
a)
58 Amps
b)
0.33 Amps
c)
13 Amps
d)
1 Amp
16.
How many Volts would it take to push 1 Amp through a resistance of 1 Ohm
a)
10 volts
b)
1 volt
c)
48 volts
d)
5 volts
17.
If the current through a circuit is 2 A and the resistance of a light bulb in the circuit is 10 Ohms, what is the voltage difference across the light bulb?
a)
5 V
b)
12 V
c)
0.2 V
d)
20 V
18.
What would the circuit resistance be if a 7.5 Amp draw was present with the engine running and the charging system producing 15 Volts
a)
15 Ohms
b)
4 Ohms
c)
0.3333 Ohms
d)
2 Ohms
19.
The current through a resistor is 0.025 A when it is connected to a 10 V voltage source. What is the resistance?
(HINT: Use VCR)
a)
0.25 ohms
b)
0.0025 ohms
c)
400 ohms
d)
40 ohms
20.
A refrigerator uses a standard voltage of 120 V and has a current of about 4.2 A. What is its power rating?
(HINT: Use PVC)
a)
504 Watts
b)
28.6 Watts
c)
0.035 Watts
d)
80 Watts
21.
What is the unit of power?
a)
Watt
b)
Ohm
c)
Volt
d)
Amp
22.
Watts is the same as...
a)
Joules per second
b)
Voltage per second
c)
Current per second
23.
The voltage supplied to a circuit is 17 V and the current running through is 10 A. What is the power generated?
a)
170 W
b)
170 A
c)
1.7 V
d)
1.7 W
24.
Calculate the electric power of an electrical appliance in which 10 A of current is flowing through a resistor of 2 ohms.
Remember: V=IR and P=VI
Remember: V=IR and P=VI
a)
80 W
b)
200 W
c)
2.5 A
d)
22.5 KJ
25.
a pair of 15-watt computer speakers are connected to a 12-volt power supply. what is the electric current running through the speakers?
a)
1.25 A
b)
0.8 A
c)
12.5 A
d)
180 A
26.
If an oven has a power of 2000 W and the voltage is 230 V what fuse is required?
a)
3A
b)
5A
c)
13A
27.
The current in an appliance is 3 A and the voltage difference is 120 V. How much power is being supplied to the appliance?
a)
10000 v
b)
220 v
c)
420 v
d)
360 v
28.
What is the current flowing into a microwave oven that requires 700 W of power if the voltage difference is 120 V?
a)
4.3A
b)
6.3 A
c)
5.83 A
d)
none
29.
Use
P = I2 x R to calculate the RESISTANCE of a component with a power of 20W and 12A current running through it.
P = I2 x R to calculate the RESISTANCE of a component with a power of 20W and 12A current running through it.
a)
0.14 Ω (2 d.p)
b)
0.03 Ω (2 d.p)
c)
0.70 Ω (2 d.p)
30.
The voltage supplied to a circuit is 17 V and the current running through is 10 A. What is the power generated?
a)
170 W
b)
170 A
c)
1.7 V
d)
1.7 W
31.
Resistance in wire depends on how thick it is, how long it is and what it is made of.
a)
true
b)
false
32.
What colour is the live wire in a mains plug?
a)
Green
b)
Blue
c)
Brown
33.
What is the function of the neutral wire?
a)
To carry a high voltage
b)
To complete circuit
c)
It is a safety wire
34.
A double insulated appliance does not need:
a)
A fuse
b)
A earth wire
c)
A neutral wire
35.
The fuse in a circuit melts when:
a)
An appliance isn't earthed
b)
Too much current flows
c)
Too much voltage flows
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