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year four

GCSE Physics - Electricity & Magnetism

Energy & Potential Difference in Circuits - Extra Calculations

8 marks over 4 questions.
You can use a calculator for this test. You need to be able to recall the right formula for each question.
1 a)

Wallace has made a new circuit with a small light bulb. The current is 3A and the resistance of the light bulb is 2 Ohms.

What is the voltage across the light bulb?		 [2]
b) Wallace has changed the light bulb for a motor, and changed the batteries for better ones. The resistance of the motor is 6 ohms, and the voltage across the motor is 24 volts.

What is the current in the circuit?		 [2]
c) Wallace’s motor ran for 15 seconds.

How much charge passed through the motor?		 [2]
d) Wallace ran the motor for an additional amount of time. The charge the passed through the motor now totals 192 coulombs.

How much extra time was the motor on for?		 [2]

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