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Magnetic fields (A-level only)

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Question 40

A step-down transformer in a workshop kiln has a primary coil of 800 turns and a secondary coil of 160 turns. The primary coil is connected to an alternating current (a.c.) mains supply with a root-mean-square (rms) voltage of 240 V. The secondary coil is connected to a heating element with a resistance of 6.4 Ω.

Assuming the transformer is 100% efficient, what is the peak power dissipated in the heating element?

A

360 W360\text{ W}360 W

B

510 W510\text{ W}510 W

C

720 W720\text{ W}720 W

D

1440 W1440\text{ W}1440 W

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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