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10.2 Resistance

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Question 3

A temperature sensing circuit has a thermistor in series with a fixed resistor across a 12 V supply. The output potential difference is measured across the fixed resistor. When the thermistor has a resistance of 6.0 kΩ6.0\ \mathrm{k}\Omega6.0 kΩ, the output potential difference is 3.0 V. The thermistor is then warmed, and the output potential difference rises to 6.0 V.

What is the resistance of the thermistor after it is warmed?

[1]
A

2.0 kΩ2.0\ \mathrm{k}\Omega2.0 kΩ

B

3.0 kΩ3.0\ \mathrm{k}\Omega3.0 kΩ

C

4.0 kΩ4.0\ \mathrm{k}\Omega4.0 kΩ

D

12 kΩ12\ \mathrm{k}\Omega12 kΩ

Markscheme

10.2 Resistance Questions

  1. GCSE
  2. /Physics
  3. /10.2 Resistance

81 exam-style questions on Edexcel GCSE Physics 10.2 Resistance, covering 10.2.1 Current in a circuit and conservation at junctions, 10.2.2 Resistance and variable resistors, 10.2.3 Series and parallel resistance, 10.2.4 I–V characteristics of components, and 10.2.5 LDRs and thermistors. Each one has a worked solution and a mark scheme showing where the marks go.

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