Mains Electricity And Its Dangers HW

Topics: Electrical wiring, Alternating current, Electricity Pages: 2 (296 words) Published: March 9, 2015
Mains electricity and its dangers
Mains electricity in the UK:
is an a.c. supply
has a frequency of 50 hertz
is about 230 V
is dangerous if not used correctly
……………………………………………………………………………………………………… Label the diagram of the three-pin plug in Figure 1 using the list of parts below. Colour the three wires or label them with the correct colours. 1Earth wire.

2Fuse.
3Live wire.
4Neutral wire.
5Cable grip.

1 Complete the sentences using words from the list below.
brass copper stiff plastic rubber or flexible plastic i) The pins of a three-pin plug are made of ……………………. . ii) A cable consists of a ………………. wire surrounded by insulating material such as ……………………… . iii) The case of a plug is made of ……………………. .

2 A mains appliance has a metal case and is connected to the mains socket by means of a mains plug and a three-core cable. Which wire (live, neutral or earth) in the cable: i provides a conducting path from the metal case to the ground? …………………………………………………………………………………………. iv) alternates in potential (voltage) between +325 V to –325 V? …………………………………………………………………………………………. v) is at or near 0 V and conducts an electric current whenever the appliance is switched on? …………………………………………………………………………………………. 3 What is the purpose of the fuse in a mains plug?

…………………………………………………………………………………………. ………………………………………………………………………………………….

4 Why is the fuse in an appliance always on the ‘live’ side of the appliance? …………………………………………………………………………………………. ………………………………………………………………………………………….

5 State two advantages a circuit breaker has in comparison with a fuse. …………………………………………………………………………………………. ………………………………………………………………………………………….

6 Why is a frayed or worn mains cable dangerous?
…………………………………………………………………………………………. ………………………………………………………………………………………….

7 Why do the wires of an electrical circuit become warm if too much current passes through them? …………………………………………………………………………………………. …………………………………………………………………………………………....
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