O-LevelPhysicsElectricity5054/21 · May/June 2016 · Q94 Marks
OR The circuit diagram shown in Fig. 9.2 uses an LDR as the sensor in an automatic night light. [Figure 9.2] When it gets dark, the lamp turns on.
- (a)State the name of component A.[1]
- (b)Explain why the lamp turns on when it gets dark.[3]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (May/June 2016). The mark or mark type is shown in brackets.
- [B1] transistor
- [B1] (in dark) resistance of LDR large/increases
- [B1] large voltage across base (and emitter)
- [B1] switches transistor on or current in collector increases
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