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Question 57

An electric toaster is connected to the 230 V230\text{ V}230 V mains supply. The power of the toaster is 1100 W1100\text{ W}1100 W.

a.

A power of 1100 W1100\text{ W}1100 W is the same as:

  • A 1100 joules per coulomb1100\text{ joules per coulomb}1100 joules per coulomb
  • B 1100 joules per second1100\text{ joules per second}1100 joules per second
  • C 1100 newtons per metre1100\text{ newtons per metre}1100 newtons per metre
  • D 1100 newtons per second1100\text{ newtons per second}1100 newtons per second
[1]
b.

State the equation linking power, current, and voltage.

[1]
c.

Show that the current in the toaster is about 5 A5\text{ A}5 A.

[2]
d.

The toaster is earthed and fitted with a fuse. Explain how the earth wire and fuse protect the user if there is a fault where a live wire touches the metal case.

[3]
e.

Another toaster has twice as much power. It is connected to the same 230 V230\text{ V}230 V mains supply. Which of these fuse ratings should be used for this toaster?

  • 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
[2]
f.

A student has a pack of fuses labelled 3 A3\text{ A}3 A. Explain how they could test one of these fuses to check that the 3 A3\text{ A}3 A rating is correct.

[3]
Markscheme

Electricity Questions

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