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Standard X

Physics

Electric Power

When connecte...

Question

When connected to the 220V mains supply, the current in a toaster, a kettle, a lamp and a fan is 5.2A, 9.4A, 0.5A and 2.6A respectively. Which appliance has the greatest electrical resistance?

toaster

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kettlein

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lamp

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fan

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Solution

The correct option is C lamp
Answer is C.
The electrical resistance of an electrical conductor is the opposition to the passage of an electric current through that conductor.
Therefore, a highly resistant body will allow only lesser amount of current to pass through it.
In this case, the current in a toaster, a kettle, a lamp and a fan is 5.2 A, 9.4 A, 0.5 A and 2.6 A respectively. So, the electrical appliance with the greatest resistance is the lamp as it allows only 0.5 A of current through it.

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(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.
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