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Energy, power and resistance

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Question 7

An experimental micro-heating element integrated into a silicon-on-insulator (SOI) sensor chip has a resistance of 450 Ω at its steady operating temperature. The element is designed to safely dissipate thermal energy at a constant rate of 180 mW.

What is the potential difference across the micro-heating element when it is operating at this power?

A

0.02 V0.02\text{ V}0.02 V

B

9.0 V9.0\text{ V}9.0 V

C

81 V81\text{ V}81 V

D

280 V280\text{ V}280 V

Markscheme

Energy, power and resistance Questions

  1. A Level
  2. /Physics
  3. /Energy, power and resistance

26 exam-style questions on OCR A A Level Physics Energy, power and resistance, covering Circuit symbols, E.m.f. and p.d, Resistance, Resistivity, and Power. Each one has a worked solution and a mark scheme showing where the marks go.

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