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4.3 Electric circuits

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Question 15

A source of constant electromotive force (e.m.f.) is connected across a light-dependent resistor (LDR). There is an electric current in the LDR.

The brightness of the light shining on the LDR is decreased.

Which of the following shows what happens to the resistance of the LDR and what happens to the current?

A

Resistance increases, current decreases

B

Resistance increases, current increases

C

Resistance decreases, current decreases

D

Resistance decreases, current increases

Markscheme

4.3 Electric circuits Questions

  1. IGCSE
  2. /Physics
  3. /4.3 Electric circuits

136 exam-style questions on CIE IGCSE Physics 4.3 Electric circuits, covering 4.3.1a Circuit diagrams and circuit components, 4.3.2a Series circuits, 4.3.2b Parallel circuits, 4.3.2c Current and potential difference in circuits, 4.3.2d Combined resistance of resistors in parallel, and 4.3.3 Action and use of circuit components. Each one has a worked solution and a mark scheme showing where the marks go.

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