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4.2 Electrical quantities

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Question 20

The operating voltage and current for four different electrical devices are:

  • Device A (soldering iron): 24 V, 2.5 A
  • Device B (turntable motor): 120 V, 0.05 A
  • Device C (neon indicator): 230 V, 1.5 mA
  • Device D (fence energiser): 8.0 kV8.0\text{ kV}8.0 kV, 10 mA

Which device develops the greatest electrical power?

A

Device A (soldering iron)

B

Device B (turntable motor)

C

Device C (neon indicator)

D

Device D (fence energiser)

Markscheme

4.2 Electrical quantities Questions

  1. IGCSE
  2. /Physics
  3. /4.2 Electrical quantities

452 exam-style questions on CIE IGCSE Physics 4.2 Electrical quantities, covering 4.2.1a Positive and negative charge, 4.2.1b Charging by friction and detecting charge, 4.2.1c Electrical conductors and insulators, 4.2.1d Electric fields and electric field patterns, 4.2.2a Electric current, charge and measuring current, 4.2.2b Conduction in metals and the direction of current, 4.2.2c Direct current and alternating current, 4.2.3a Electromotive force, 4.2.3b Potential difference and voltmeters, 4.2.4a Resistance, 4.2.4b Resistance of a metallic wire, 4.2.4c Current–voltage graphs, and 4.2.5 Electrical energy and electrical power. Each one has a worked solution and a mark scheme showing where the marks go.

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