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Energy, power and resistance

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Question 9

A non-ohmic electronic component has a current-voltage (III-VVV) characteristic described by the relationship:

I=αV2 I = \alpha V^2 I=αV2

where α=1.5×10−2 A V−2\alpha = 1.5 \times 10^{-2} \text{ A V}^{-2}α=1.5×10−2 A V−2 and V V\,V is the potential difference across the component.

What is the electrical resistance of this component when the potential difference across it is 4.0 V?

A

0.060 Ω0.060\ \Omega0.060 Ω

B

8.3 Ω8.3\ \Omega8.3 Ω

C

17 Ω17\ \Omega17 Ω

D

0.24 Ω0.24\ \Omega0.24 Ω

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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