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Magnetic fields (A-level only)

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Question 32

An experimental heating system consists of two independent heating elements, A and B. Element A, of resistance RRR, is connected to a direct current (dc) supply of constant voltage VVV, dissipating a thermal power PPP.

Element B, of resistance 0.5R0.5R0.5R, is connected to an alternating current (ac) supply that provides a sinusoidal voltage with a peak value of 3V.

What is the average power dissipated by Element B in terms of PPP?

A

4.5P4.5P4.5P

B

9P9P9P

C

18P18P18P

D

36P36P36P

Markscheme

Magnetic fields (A-level only) Questions

  1. A Level
  2. /Physics
  3. /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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