A circuit contains five identical resistors and four identical voltmeters. The reading on voltmeter V1 is 8.0 V and the reading on voltmeter V2 is 1.0 V. What are the readings on V3 and V4 ?
reading on voltmeter V3 / V
reading on voltmeter V4 / V
A.
1.5
1.0
B.
3.0
2.0
C.
4.5
3.0
D.
6.0
4.0
Choose your answer A B C D
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A power cable X has resistance R and carries current I . A second cable Y has resistance 2R and carries current .
What is the ratio ?
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Two resistors are connected to a cell.
Assuming both resistors are made from wires of the same length, which graph shows how the potential V varies along the line XY?
Choose your answer A B C D
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Kirchhoff’s laws are applied to the circuit shown.
What is the equation for the dotted loop?
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In the circuit shown, the fixed resistor has a value of 3 Ω and the variable resistor varies between 0 Ω and 12 Ω.
The power supply has an emf of 15 V and negligible internal resistance.
What is the range of potential differences V which can be measured across the 3 Ω resistor?
Choose your answer A B C D
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Four resistors are connected to a battery of e.m.f. 6 V as shown.
If the battery has negligible internal resistance, what is the current in the battery?
Choose your answer A B C D
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Which of the following cannot be the units for resistivity?
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Three resistors are connected to a cell of e.m.f. 10 V and negligible internal resistance as shown.
What is the power dissipated in one of the 2 Ω resistors and in the whole circuit?
power dissipated in the 2 Ω resistor / W
power dissipated in the whole circuit / W
A
1
18
B
1
20
C
2
18
D
2
20
Choose your answer A B C D
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Three identical lamps, W, X and Y are connected to a cell of negligible internal resistance as shown.
When the switch is closed, each lamp is lit. Which of the following correctly describes the brightness of lamps W, X and Y when the switch is opened?
lamp W
lamp X
lamp Y
A
increases
increases
decreases
B
decreases
off
decreases
C
decreases
off
increases
D
increases
decreases
decreases
Choose your answer A B C D
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A science student who lives in the UK, where the mains voltage is 240 V, buys a light bulb marked 60 W which she uses in her bedroom. The student takes the lightbulb with her on a trip to Canada where the mains voltage is 100 V and also uses it there.
Which line correctly identifies the approximate power dissipated in the bulb in the UK and Canada?
UK / W
Canada / W
A.
30
10
B.
60
30
C.
60
10
D.
120
60
Choose your answer A B C D
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