O-LevelPhysicsElectricity5054/21 · Oct/Nov 2019 · Q68 Marks
A 60W filament lamp is powered by the 240 V mains electricity supply. The lamp is switched on.
- (a)(i)Calculate: the current in the lamp[2]
- (a)(ii)the resistance of the lamp.[2]
- (b)(i)The lamp is now unplugged from the mains supply and connected in series with two 1.5V cells. Fig. 6.1 is the circuit diagram. State the reading on the voltmeter.[1]
- (b)(ii)State and explain how the resistance of the lamp now differs from the value calculated in (a)(ii).[2]
- (b)(iii)When a filament lamp blows, it very often does so immediately after being switched on. Suggest why this is the case.[1]
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 (Oct/Nov 2019). The mark or mark type is shown in brackets.
- [C1] (I =) P/ V or 60/240
- [A1] 0.25 A
- [C1] (R =) V// or 240/0.25
- [A1] 960 Ω
- [B1] 3.0 V
- [B1] resistance is smaller
- [B1] (filament at a) lower temperature
- [B1] current surge (due to lower resistance when cold)
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