An electric kettle for use on a 230 V supply is rated 3000 W. For safe working, the cable connected to it should be able to carry at least:

(a) 2 A
(b) 5 A
(c) 10 A
(d) 15 A

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Solution

(d) 15 A
Current drawn by the kettle, I = $\frac{P}{V} = \frac{3000}{230} = 13 A$
So the cable should be able to carry more current than this and hence the answer is 15 A.

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An electric kettle for use in a 230 V supply is rated at 3000 W. For safe working what should be the current carried by a cable connected to it?

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The table below shows the current in three different electrical appliances when connected to the 240 V mains supply :

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Lamp 0.4 A

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(a) Which appliance has the greatest electrical resistance ? How does the data show this ?

(b) The lamp is connected to the mains supply by using a thin, twin-cored cable consisting of live and neutral wires. State two reasons why this cable should not be used for connecting the kettle to the mains supply.

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Q. The table below shows the current in three different electrical appliances when connected to the 240 V mains supply:

Appliance	Current
Kettle	08.5 A
Lamp	0.4 A
Toaster	4.8 A

(a) Which appliance has the greatest electrical resistance? How does the data show this?
(b) The lamp is connected to the mains supply by using a thin, twin-cored cable consisting of live and natural wires. State two reasons why this cable should not be used for connecting the kettle to the mains supply.
(c) Calculate the power rating of the kettle when it is operated from the 240 V mains supply.
(d) A main takes the kettle abroad where the mains supply is 120 V. What is the current is the kettle when it is operated from the 120 V supply?

Q. A 3-pin mains plug is fitted to the cable for a 1 kW electric kettle to be used on a 250 V a.c. supply. Which of the following statements is not correct?

(a) The fuse should be fitted in the live wire
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(c) The neutral wire is coloured black
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An electric kettle for use on a 230 V supply is rated 3000 W. For safe working, the cable connected to it should be able to carry at least: (a) 2 A (b) 5 A (c) 10 A (d) 15 A

(d) 15 A Current drawn by the kettle, I = PV=3000230 =13 A So the cable should be able to carry more current than this and hence the answer is 15 A.

An electric kettle for use on a 230 V supply is rated 3000 W. For safe working, the cable connected to it should be able to carry at least:

(a) 2 A
(b) 5 A
(c) 10 A
(d) 15 A

(d) 15 A
Current drawn by the kettle, I = $\frac{P}{V} = \frac{3000}{230} = 13 A$
So the cable should be able to carry more current than this and hence the answer is 15 A.