O-LevelPhysicsElectricity5054/21 · May/June 2019 · Q65 Marks
Fig. 6.1 shows the fuse inside the plug of a hairdryer. [Figure 6.1]
- (a)State how the fuse protects the wires in the hairdryer.[1]
- (b)(i)The hairdryer is rated at 240 V, 1500 W. It is switched on. Calculate the current in the hairdryer.[2]
- (b)(ii)Suggest a suitable current rating for the fuse.[1]
- (c)The hairdryer does not contain an earth wire to connect to the plug. State the feature of the hairdryer which ensures that it is safe to use without an earth wire.[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 (May/June 2019). The mark or mark type is shown in brackets.
- [1] blows / melts / cuts off circuit / stops current and when the current is high
- [1] (I =) P/V numerical or algebraic
- [1] 6.2, 6.25 or 6.3 A
- [1] any integral value 7–13 A
- [1] double insulated or outside case / body is plastic / rubber
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