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4.5 Electromagnetic effects

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Question 170

A 240 V power supply and a 100% efficient transformer are used to power a 12 V, 48 W lamp.

What is the current in the power supply?

A

0.20 A0.20\text{ A}0.20 A

B

4.0 A4.0\text{ A}4.0 A

C

5.0 A5.0\text{ A}5.0 A

D

20 A20\text{ A}20 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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