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2.3.1a Thermal conductors and thermal insulators

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Question 22

A heating element in an electric heater consists of a metal wire that glows red when a current passes through it. The middle of the wire is at a very high temperature, while the ends, connected to the cooler terminal supports on the heater frame, are at a much lower temperature. Which statement is correct?

A

Thermal energy is conducted along the wire from the middle towards the terminal supports.

B

The wire radiates electromagnetic energy equally from all parts of its surface.

C

All of the electrical input energy is transferred by the heater as infrared radiation.

D

If the potential difference across the wire is doubled, the power output is doubled.

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2.3.1a Thermal conductors and thermal insulators Questions

  1. IGCSE
  2. /Physics
  3. /2.3.1a Thermal conductors and thermal insulators

67 exam-style questions on CIE IGCSE Physics 2.3.1a Thermal conductors and thermal insulators. Each one has a worked solution and a mark scheme showing where the marks go.

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