8.9 Household Electricity

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Presentation transcript:

8.9 Household Electricity A. Check your concepts Study each of the following statements. Put a ‘T’ in the box against a correct statement and a ‘F’ against an incorrect statement. 1. The mains voltage in Hong Kong is 220 V. T 2. The ring circuit is a series circuit. F

3. The fuse in a three-pin plug is connected to the live wire. 4. The earth wire is a safety device and normally does not carry electricity. T

B. Label the diagram (a) (b) (c) (d) wire fuse earth neutral live cable grip fuse earth neutral live

Complete the table on the colour of wires. Colour code Live Neutral Earth brown blue yellow and green

C. Questions mains supply Fig. 1 Fig. 2 1.Two appliances are connected to a ring mains circuit (Fig. 1) and to a parallel (Fig. 2) respectively. In which case (Fig.1 or Fig. 2) will the two appliances still work if the wire is broken at point X? ___________________ (1 mark) Fig. 1

2. The operating currents of several appliances are shown below. Electric kettle Refrigerator TV set Air conditioner Operating current 10 A 1A 7 A They are all connected to the same socket with a 15 A fuse. 15 A fuse mains supply socket

It will melt and break the circuit. (a) If all these appliances were switched on together, what would be the main current? (1 mark) _____________________________________ 28 A (b) What will happen to the 15 A fuse? (1 mark) _____________________________________ It will melt and break the circuit. (c) How could you avoid this? (1 mark) _____________________________________ _____________________________________ Do not connect too many appliances to the same socket.

-The fuse should be connected to the live wire. The above electric iron was returned to the electrical appliances company by a careful customer. Give TWO reasons to explain why the customer did so. (2 marks) _______________________________________ _______________________________________ 3. The electric iron does not have an earth wire. -The fuse should be connected to the live wire.

4. 1 4 3 5 2 Live wire touches the metal casing. Fuse Cable grip Earth wire Neutral wire Outer insulation Electric cooker Live Neutral Earth Connecting to casing Three-pin plug An electric cooker is connected to a three-pin plug as shown in the diagram above. Arrange the order of what will happen when he live wire accidentally touches the metal casing of the electric cooker. Live wire touches the metal casing. Electric current stops flowing. The fuse in the plug will blow. The man is safe. The current will become excessively large and flows through the earth wire. 4. 1 4 3 5 2