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Question 26

A portable electric vehicle (EV) charging cable is stored on a wall-mounted tidy spool. There is a safety warning label printed on the spool:

SAFETY WARNING

  • when cable fully uncoiled: 3600 W3600\text{ W}3600 W, 240 V240\text{ V}240 V
  • when cable left coiled: 1100 W1100\text{ W}1100 W, 240 V240\text{ V}240 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)
110011001100240240240?
36003600360024024024015.015.015.0
[1]
c.

The charging cable plug is fitted with a 20 A20\text{ A}20 A fuse. Describe how the fuse protects the cable.

[2]
d.

Explain why a 10 A10\text{ A}10 A fuse is not suitable for this charging cable.

[2]
e.

Suggest why the maximum allowable power is lower when the cable is left coiled on the hanger.

[2]

Mains electricity Questions

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