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4.5 Electromagnetic effects

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Question 121

A step-down transformer is 100% efficient. It has an input voltage of 230 V a.c. and an output voltage of 11.5 V a.c.

The current in the primary coil is 0.20 A.

What is the current in the secondary coil?

A

0.010 A0.010\text{ A}0.010 A

B

0.20 A0.20\text{ A}0.20 A

C

4.0 A4.0\text{ A}4.0 A

D

40 A40\text{ A}40 A

Markscheme

4.5 Electromagnetic effects Questions

  1. IGCSE
  2. /Physics
  3. /4.5 Electromagnetic effects

275 exam-style questions on CIE IGCSE Physics 4.5 Electromagnetic effects, covering 4.5.1a Electromagnetic induction, 4.5.1b Direction of an induced e.m.f., 4.5.2 The a.c. generator, 4.5.3a Magnetic effect of a current and its applications, 4.5.3b Strength and direction of the field around wires and solenoids, 4.5.4a Force on a current-carrying conductor, 4.5.4b Force on beams of charged particles, 4.5.5 The d.c. motor, 4.5.6a Construction and operation of a transformer, 4.5.6b Turns ratio and current in a transformer, and 4.5.6c High-voltage transmission of electricity. Each one has a worked solution and a mark scheme showing where the marks go.

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