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10.2 Resistance

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Question 1

A temperature alarm contains a thermistor in series with a 2.0 kΩ2.0\ \mathrm{k}\Omega2.0 kΩ resistor across a 12 V supply. The thermistor has a resistance of 8.0 kΩ8.0\ \mathrm{k}\Omega8.0 kΩ when cool and 2.0 kΩ2.0\ \mathrm{k}\Omega2.0 kΩ after it is warmed.

By how much does the current in the circuit increase?

[1]
A

6.0 mA6.0\ \mathrm{mA}6.0 mA

B

1.8 mA1.8\ \mathrm{mA}1.8 mA

C

1.2 mA1.2\ \mathrm{mA}1.2 mA

D

3.0 mA3.0\ \mathrm{mA}3.0 mA

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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