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Mains electricity

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Question 8

A portable travel hair dryer is connected to the 230 V230\text{ V}230 V mains supply. The power of the hair dryer is 800 W800\text{ W}800 W.

a.

A power of 800 W800\text{ W}800 W is the same as:

  • A 800 joules per coulomb800\text{ joules per coulomb}800 joules per coulomb
  • B 800 coulombs per second800\text{ coulombs per second}800 coulombs per second
  • C 800 joules per second800\text{ joules per second}800 joules per second
  • D 800 newtons per second800\text{ newtons per second}800 newtons per second
[1]
b.

State the equation linking power, current, and voltage.

[1]
c.

Show that the current in the hair dryer is about 3.5 A3.5\text{ A}3.5 A.

[2]
d.

The hair dryer has a metal casing and 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 casing.

[4]
e.

Another model of hair dryer 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 hair dryer?

  • 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]
f.

A technician has a pack of fuses labelled 5 A5\text{ A}5 A. Explain how they could test one of these fuses to check that the 5 A5\text{ A}5 A rating is correct.

[3]

Mains electricity Questions

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