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WorksheetsGCSE Electricity End of Topic Test
Total questions: 50
Worksheet time: 25mins
Which of these is a symbol for a thermistor?
Which of these circuits are parallel circuits?
X and Y only
X and Z only
Y and Z only
All of them
Which of these statements is not true? Assume that Q and R are the same resistance.
Which of these statements is not true? Assume that Q and R are the same resistance.
The current is the same at P and S.
The current is the same at P and S.
The current is the same at P and Q.
Dave investigates the current in a lamp. Here is part of his circuit.
Dave uses the variable resistor to change the current. Dave wants to measure the current in the lamp.
He should connect
a voltmeter in series with the lamp
a voltmeter in parallel with the lamp
an ammeter in series with the lamp
an ammeter in parallel with the lamp
What is a flow of charged particles called?
Potential difference
Resistance
Current
Voltage
If 25 C of charge transfers 50 J of energy between two points, what is the voltage between those points?
2.5 V
2.0 V
0.5 V
5.0 V
What row of the table correctly shows the symbol and unit of charge?
A
B
C
D
Jane and Kim are investigating how the current in a fixed resistor varies with voltage.
They conduct the investigation once. Here is their first graph.
They conduct the investigation again. The new resistor has a higher resistance. Which of these could be their new graph?
Elaine and Esther measure the current in different resistors.
They also measure the voltage across each resistor.
These are their results.
10.0 A
4.00 A
0.250 A
0.125 A
A 2 Ω and a 3 Ω resistor in series give what total resistance?
6.0 Ω
5.0 Ω
1.5 Ω
1.0 Ω
The diagram shows a resistor network.
The total resistance between points X and Y is
More than 16 Ω
16 Ω
8 Ω
Less than 8 Ω
In 1827, Georg Ohm investigated how the current in a conductor changes with voltage. Ohm’s conductor was a fixed resistor.
Which of these graphs shows his results?
A diode affects the current in a circuit.
Faiza plans to control a lamp and a room heater automatically.
She finds this information about a thermistor.
What temperature change corresponds to a resistance change from 7000 Ω to 2000 Ω?
2.0 oC
26 oC
30 oC
32 oC
The thermistor in the circuit
will allow the current to increase when the temperature rises
only works for temperatures above 0 °C
has a resistance that is proportional to its temperature
has a resistance that is directly proportional to its temperature
The motor has a power of 144 watts.
Some of Jim’s friends try to explain what a power of 144 watts means.
Which explanation is correct?
It tells you the efficiency of the motor
It tells you how much energy is transferred each second
It tells you the motor can produce 144 amps in a second
It tells you how much energy is wasted each second
The energy produced by a solar cell is measured in
Volts
Amps
Watts
Joules
The photograph shows part of the power monitoring board for a combined wind generator (WG) and solar panel (PV) which charge a battery.
The photograph shows that the power supplied to the battery is about
6.5 W
13 W
26 W
75 W
For a coal mine winch, the voltage used is 440 V. When the power in the motor is 37 kW the current is approximately
0.084 A
84 A
16 300 A
16 300 000 A
The graph shows a current.
direct current
indirect current
alternating current
transverse current
Which of these is a source of direct electric current?
a light-dependent resistor
a thermistor
a solar cell
the national grid
In a mains circuit the fuse should be placed connecting to
the live wire
the neutral wire
the earth wire
both earth and live wires
What is the function of the Earth connection?
Provides a path of lower resistance for current to prevent electrocution
Provides a path of higher resistance for current to prevent electrocution
Provides a back up failure to the fuse
Provides no extra safety
Jason and Zubeda are investigating how current varies with voltage for a filament lamp.
Which circuit should they use?
Jason and Zubeda present their results as a graph.
What is the resistance of the filament lamp at 6 V?
0.25 Ω
1.5 Ω
4.0 Ω
9.0 Ω
Which of these is a correct analysis of their graph?
The resistance of the lamp increases when the current increases
The resistance of the lamp decreases when the current increases
The current in the lamp is directly proportional to the voltage across it
The voltage across the lamp is directly proportional to the current in it
Jason and Zubeda repeat their experiment.
They also include measurements made with the battery connections reversed.
Which graph shows their new results?
Which of these is a symbol for a fuse?
In 1827, Georg Ohm investigated how the current in a conductor changes with voltage.
Which of these circuits would he have used?
An electric current in a wire is a flow of
metal ions
metal atoms
protons
electrons
One ammeter in this circuit is reading 3 A. What is the reading on the other ammeter?
1 A
2 A
3 A
4 A
Which of these combinations will give the largest current in a circuit?
high voltage, high resistance
low voltage, high resistance
high voltage, low resistance
high voltage, low resistance
What unit is charge measured in?
Volts
Amps
Coulombs
Joules
What current flows if 10 C flow past a point in 2 minutes?
0.083 A
5 A
20 A
0.5 A
Ben has a small battery operated fan. He uses the fan to keep himself cool.
Ben wants to make the fan spin more slowly.
He adds a resistor in series with the fan circuit which decreases the speed of the motor.
Which of these explains why the fan spins more slowly?
Adding the resistor decreases the voltage across the battery
Adding the resistor increases the power of the battery
Adding the resistor increases the friction in the motor
Adding the resistor decreases the current in the motor
A battery is connected to the lamp of a torch.
The current in the lamp is 0.5 A and its resistance is 6 Ω. Use Ohm’s law to calculate the voltage across the lamp.
3.0 V
5.5 V
6.5 V
12 V
Two identical resistors connected in series have a total resistance of 8 Ω.
The same two resistors when connected in parallel have a total resistance of
Less than 8 Ω
More than 8 Ω
16 Ω
8 Ω
Which combination of resistors has the smallest total resistance?
The shutter of a digital camera is kept open for different times.
The length of time depends on the brightness.
Which of these controls how long the shutter is kept open?
a thermistor
a dynamo
a light depenent resistor
a stopwatch
Jimmy adds a circuit which will make his fan switch on when the room is warm.
Which sensor would Jimmy use in this circuit?
a thermistor
a filament lamp
an electromagnet
an LDR
The students make this circuit using the same thermistor.
Which row of the table shows the conditions for the highest current in the ammeter?
first is brightness of light shining on LDR
second is the temperature on teh thermistor
bright low
bright high
dim low
dim high
Which of the following current-potential difference (I-V) graphs correctly shows the behaviour of a diode?
A child’s toy is operated by a small motor. The potential difference across the motor is 6.0 V and the current in it is 0.20 A. The energy used by the motor in 120 s is
2.4 J
60 J
144 J
3600 J
The rate of transfer of electrical energy is the same as
resistance
current
voltage
power
The voltage across the motor is 4 V.
An ammeter shows a current of 0.2 A in the motor. Use a suitable formula to calculate the power of the motor
The power of the motor is
0.05 W
0.8 W
8 W
20 W
What power is transmitted by a current of 2 A flowing through a 6 Ω resistor?
12 W
3 W
24 W
6 W
Which of these diagrams correctly compares alternating current (a.c.) and direct current (d.c.)?
Sally and Kate are investigating electric current during Science lessons.
Kate correctly explains direct current to Sally.
A direct current in a wire is a flow of charge
caused by resistance
in one direction only
that reverses
which occurs when the wire is heated
A plastic torch does not need a fuse because
the lamp produces light
the torch has a switch
the torch is earthed
the torch is double insulated
A fuse works by
boiling when the current is too low
boiling when the current is too high
melting when the current is too low
melting when the current is too high
