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Mains electricity

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Question 1

An extension cable is stored on a reel. There is a warning label on the reel:

WARNING

  • when cable fully extended: 2300 W2300\text{ W}2300 W, 230 V230\text{ V}230 V
  • when cable coiled up: 850 W850\text{ W}850 W, 230 V230\text{ V}230 V
a.

State the equation linking power, current, and voltage.

[1]
b.

Complete the table by finding the missing current value, rounded to 1 decimal place:

Power (W)Voltage (V)Current (A)
850850850230230230?
23002300230023023023010.010.010.0
[2]
c.

The extension cable is fitted with a 13 A13\text{ A}13 A fuse. Describe how the fuse protects the cable.

[2]
d.

Explain why a 5 A5\text{ A}5 A fuse is not suitable for this extension cable.

[2]
e.

Suggest why the maximum allowable power is lower when the cable is coiled up.

[2]

Mains electricity Questions

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