WorksheetsCircuits and Electronics Review
Total questions: 20
Worksheet time: 20mins
Name
Class
Date
1.
The circuits contain identical lamps and identical cells. In which circuit will the lamps be brightest?
a)
A
b)
B
c)
C
d)
D
2.
Current is measured in:
a)
volts
b)
amperes
c)
ohms
d)
watts
3.
Resistance is measured in:
a)
volts
b)
amps
c)
ohms
d)
watts
4.
Which of these is NOT a requirement for a simple circuit?
a)
Voltage
b)
Load
c)
Conductor
d)
Light
5.
A conductor
____________________________
____________________________
a)
will not conduct current
b)
resists current flow
c)
provides a path for current flow
d)
provides no path for current flow
6.
What is the name of the following component?
a)
resistor
b)
light dependent resistor
c)
variable resistor
d)
thermistor
7.
What is the name of the following component
a)
AND gate
b)
OR gate
c)
NAND gate
d)
NOR gate
8.
What are rheostats used for?
a)
To control large amounts of heat
b)
To vary large amounts of current
c)
To control of a circuit's power rating
d)
To vary a circuit's tolerance
9.
Why are lamps in the lighting circuit of a house connected in parallel and not in series?
a)
It allows them to be switched on and off independently.
b)
It uses less electrical energy.
c)
The filaments are less likely to burn out.
d)
The p.d. across each lamp is reduced.
10.
Which circuit will act as a variable potential divider?
a)
A
b)
B
c)
C
d)
D
11.
The circuit shown contains a light dependent resistor (LDR) and an ammeter, in series with a battery.
How does the circuit behave when more light shines on it?
How does the circuit behave when more light shines on it?
a)
resistance of LDR - decreases
current through ammeter - decreases
current through ammeter - decreases
b)
resistance of LDR - decreases
current through ammeter - increases
current through ammeter - increases
c)
resistance of LDR - increases
current through ammeter - decreases
current through ammeter - decreases
d)
resistance of LDR - increases
current through ammeter - increases
current through ammeter - increases
12.
In the circuit, which ammeter shows the greatest reading?
a)
A
b)
B
c)
C
d)
D
13.
A thermistor is used in a circuit to control a piece of equipment automatically. What might this circuit be used for?
a)
lighting an electric lamp as it becomes darker
b)
ringing an alarm bell if a locked door is opened
c)
switching on a water heater at a pre-determined time
d)
turning on an air conditioner when the temperature rises
14.
The circuit diagram includes two resistors connected in parallel.
Which statement is correct?
Which statement is correct?
a)
The current in wire P is equal to the current in wire Q.
b)
The current in wire Q is equal to the current in wire R.
c)
The current in wire R is equal to the current in wire S.
d)
The current in wire S is equal to the current in wire P.
15.
A 3.0 Ω lamp and a 6.0 Ω lamp are connected in parallel. What is the total resistance of the combination?
a)
0.5 Ω
b)
2.0 Ω
c)
9.0 Ω
d)
18.0 Ω
16.
When the potential difference (p.d.) across a piece of resistance wire is changed, the current through the wire also changes. The temperature of the wire is kept the same.
Which graph shows how the p.d. and current are related?
Which graph shows how the p.d. and current are related?
a)
A
b)
B
c)
C
d)
D
17.
Which electrical component would not normally be found in a battery-operated torch (flashlight)?
a)
A
b)
B
c)
C
d)
D
18.
Four lamps are labelled ‘60 W 240 V’.
In which circuit are the lamps connected so that they all work at normal brightness?
In which circuit are the lamps connected so that they all work at normal brightness?
a)
A
b)
B
c)
C
d)
D
19.
Which graph shows the output of a simple a.c. generator?
a)
A
b)
B
c)
C
d)
D
20.
Which statements describe a NAND gate?
a)
I and II
b)
I and III
c)
II and III
d)
I, II and III
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