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Magnetic fields (A-level only)

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Question 7

An industrial thermal bath is designed to run using one of two alternative heating elements. Element 1 has a resistance R R\,R and is powered by a direct current (DC) of constant value III, dissipating a power PPP. Element 2 has a resistance of 34R\displaystyle \frac{3}{4}R43​R and is powered by an alternating current (AC) supply with a peak current of 2I2I2I.

What is the mean power dissipated by Element 2 in terms of PPP?

A

34P\frac{3}{4}P43​P

B

32P\frac{3}{2}P23​P

C

3P3P3P

D

6P6P6P

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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