EASY
AS and A Level
IMPORTANT
Earn 100

A car headlamp bulb has a resistance of 36Ω. Calculate the current in the lamp when connected to a '12V' battery.

Important Questions on Electric Current, Potential Difference and Resistance

EASY
AS and A Level
IMPORTANT
Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 8 - Electric Current, Potential Difference and Resistance>Questions>Q 13

You can buy lamps of different brightness to fit in light fittings at home (Figure). A 100 watt lamp glows more brightly than a 60 watt lamp. Explain which of the lamps has the higher resistance.

Question Image

EASY
AS and A Level
IMPORTANT
Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 8 - Electric Current, Potential Difference and Resistance>Questions>Q 14

(a ) Calculate the potential difference across a motor carrying a current of 1.0 A and having a resistance of 50Ω.

EASY
AS and A Level
IMPORTANT
Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 8 - Electric Current, Potential Difference and Resistance>Questions>Q 14
(b) Calculate the potential difference across the same motor when the current is doubled. Assume its resistance remains constant.
EASY
AS and A Level
IMPORTANT
Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 8 - Electric Current, Potential Difference and Resistance>Questions>Q 15
Calculate the resistance of a lamp carrying a current of 0.40 A when connected to a 230 V supply.
EASY
AS and A Level
IMPORTANT
Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 8 - Electric Current, Potential Difference and Resistance>Question>Q 16

In Figure the reading on the ammeter is 2.4 A and the reading on the voltmeter is 6.0V Calculate the resistance of the metallic conductor.

Question Image

Connecting an ammeter and a voltmeter to determine the resistance of a metallic conductor in a circuit.

EASY
AS and A Level
IMPORTANT
Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 8 - Electric Current, Potential Difference and Resistance>Questions>Q 17
Calculate the current in a 60 W light bulb when it is connected to a 230 V power supply.
EASY
AS and A Level
IMPORTANT
Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 8 - Electric Current, Potential Difference and Resistance>Questions>Q 18
A power station supplies electrical energy to the grid at a voltage of 25kV. Calculate the output power of the station when the current it supplies is 40kA.
EASY
AS and A Level
IMPORTANT
Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 8 - Electric Current, Potential Difference and Resistance>Questions>Q 19
A calculator is powered by a 3.0 V battery. The calculator's resistance is 20kΩ. Calculate the power transferred to the calculator.