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AQA A-level Physics EMF Exam Style Questions
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An assortment of AQA A-level Physics EMF exam style questions. Mark scheme included in package deal.
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theonlinephysicstutor.comA student investigates how the potential difference V across the terminals of a cell varies with the
1 current I in the cell.
Which graph correctly shows how V varies with I?
A
B
C
D
(Total 1 mark)
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Page 2 of 57
, theonlinephysicstutor.com
The circuit in Figure 1 is used to investigate how the potential difference V between the terminals
2
of a cell varies as the current I in the circuit changes. Figure 2 shows the graph of the results.
Figure 1 Figure 2
Which one of the following can be deduced from the gradient of the graph?
A The internal resistance of the cell
B The e.m.f. of the cell
C The power dissipated by the cell
D The resistance of the variable resistor
(Total 1 mark)
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Page 3 of 57
, theonlinephysicstutor.com
In the circuit shown, V is a voltmeter with a very high resistance. The internal resistance of the
3
cell, r, is equal to the external resistance in the circuit.
external resistance
Which of the following is not equal to the emf of the cell?
A the reading of the voltmeter when the Switch S is open
B the chemical energy changed to electrical energy when
unit charge passes through the cell
C twice the reading of the voltmeter when the switch S is
closed
D the electrical energy produced when unit current passes
through the cell
(Total 1 mark)
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Page 4 of 57
, theonlinephysicstutor.com
The cell in the circuit has an emf of 2.0 V. When the variable resistor has a resistance of 4.0 Ω,
4 the potential difference (pd) across the terminals of the cell is 1.0 V.
What is the pd across the terminals of the cell when the resistance of the variable resistor is 12
Ω?
A 0.25 V
B 0.75 V
C 1.33 V
D 1.50 V
(Total 1 mark)
A battery is connected to a 10 Ω resistor and a switch in series. A voltmeter is connected across
5 the battery. When the switch is open (off) the voltmeter reads 1.45 V. When the switch is closed
the reading is 1.26 V.
What is the internal resistance of the battery?
A 0.66 Ω
B 0.76 Ω
C 1.3 Ω
D 1.5 Ω
(Total 1 mark)
(a) Define the electromotive force (emf) of an electrical power supply.
6
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(2)
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Page 5 of 57
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