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In the circuit shown in the diagram the cell has negligible internal resistance.
1
What happens to the reading of both meters when the resistance of R is decreased?
Reading of ammeter Reading of voltmeter
A increases increases
B increases decreases
C decreases increases
D unchanged decreases
(Total 1 mark)
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The circuit diagram below shows a 12 V battery of negligible internal resistance connected to a
2 combination of three resistors and a thermistor.
(a) When the resistance of the thermistor is 5.0 kΩ
(i) calculate the total resistance of the circuit,
total resistance = ......................................... kΩ
(3)
(ii) calculate the current in the battery.
current = ........................................ mA
(1)
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(b) A high-resistance voltmeter is used to measure the potential difference (pd) between points
A-C, D-F and C-D in turn.
Complete the following table indicating the reading of the voltmeter at each of the three
positions.
voltmeter
pd / V
position
A-C
D-F
C-D
(3)
(c) The thermistor is heated so that its resistance decreases. State and explain the effect this
has on the voltmeter reading in the following positions.
(i) A–C........................................................................................................
...............................................................................................................
...............................................................................................................
...............................................................................................................
(2)
(ii) D–F........................................................................................................
...............................................................................................................
...............................................................................................................
...............................................................................................................
(2)
(Total 11 marks)
(a) Define the volt.
3
........................................................................................................................
........................................................................................................................
(1)
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Page 4 of 31
In the circuit shown in the diagram the cell has negligible internal resistance.
1
What happens to the reading of both meters when the resistance of R is decreased?
Reading of ammeter Reading of voltmeter
A increases increases
B increases decreases
C decreases increases
D unchanged decreases
(Total 1 mark)
@TOPhysicsTutor facebook.com/TheOnlinePhysicsTuto
Page 2 of 31
, theonlinephysicstutor.com
The circuit diagram below shows a 12 V battery of negligible internal resistance connected to a
2 combination of three resistors and a thermistor.
(a) When the resistance of the thermistor is 5.0 kΩ
(i) calculate the total resistance of the circuit,
total resistance = ......................................... kΩ
(3)
(ii) calculate the current in the battery.
current = ........................................ mA
(1)
@TOPhysicsTutor facebook.com/TheOnlinePhysicsTuto
Page 3 of 31
, theonlinephysicstutor.com
(b) A high-resistance voltmeter is used to measure the potential difference (pd) between points
A-C, D-F and C-D in turn.
Complete the following table indicating the reading of the voltmeter at each of the three
positions.
voltmeter
pd / V
position
A-C
D-F
C-D
(3)
(c) The thermistor is heated so that its resistance decreases. State and explain the effect this
has on the voltmeter reading in the following positions.
(i) A–C........................................................................................................
...............................................................................................................
...............................................................................................................
...............................................................................................................
(2)
(ii) D–F........................................................................................................
...............................................................................................................
...............................................................................................................
...............................................................................................................
(2)
(Total 11 marks)
(a) Define the volt.
3
........................................................................................................................
........................................................................................................................
(1)
@TOPhysicsTutor facebook.com/TheOnlinePhysicsTuto
Page 4 of 31
