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Magnetic fields (A-level only)

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Question 16

A calibration test compares two electric heating elements. Element 1 has resistance $R\,$ and is operated by a direct current $I$ , dissipating a power $P$ .

Element 2 has a resistance of $2.5R\,$ and is operated by a sinusoidal alternating current with a peak current of $4 I$ .

What is the average power dissipated in Element 2?

$10 P$

$20 P$

$40 P$

$80 P$

Markscheme

Magnetic fields (A-level only) Questions

A Level
Physics
Magnetic fields (A-level only)

66 exam-style questions on AQA A Level Physics Magnetic fields (A-level only), covering Magnetic flux density (A-level only), Moving charges in a magnetic field (A-level only), Magnetic flux and flux linkage (A-level only), Electromagnetic induction (A-level only), Alternating currents (A-level only), and The operation of a transformer (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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