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Mains electricity

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Question 1
a.

An electric lawnmower has a power of 2.4 kW2.4\text{ kW}2.4 kW when operating at a mains voltage of 230 V230\text{ V}230 V.

State the equation linking power, current and voltage.

[1]
b.

Show that the current in the lawnmower is about 10 A10\text{ A}10 A.

[2]
c.

Which fuse rating would be suitable for the lawnmower?

  • A 3 A3\text{ A}3 A
  • B 5 A5\text{ A}5 A
  • C 10 A10\text{ A}10 A
  • D 13 A13\text{ A}13 A
[1]
d.

The lawnmower is powered by mains electricity, which is an alternating current (a.c.) supply.

Describe the difference between alternating current (a.c.) and direct current (d.c.).

[2]
e.

State a source of direct current.

[1]

Mains electricity Questions

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