If a heater draws $5 A$ current from a $240 V$ supply, what is the potential on the neutral wire?

0 V

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5 V

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120 V

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240 V

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Solution

The correct option is A $0 V$
Potential of a neutral wire is always zero and that's why it is called so. Whenever we say the potential of the appliance is $V$ volts, we mean the potential of live wire.

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

Appliance current

Kettle 8.5 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 neutral wires. State two reasons why this cable should not be used for connecting the kettle to the mains supply.

(d) A man takes the kettle abroad where the mains supply is 120 V. What is the current in the kettle when it is operated from the 120 V supply ?

If 240V voltage is applied to an electric heater , 2 A curcurr passes through it. Find the current flowing in the heater if 120V voltage is applied to it and also calculate the resistance of the coil of heater.

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If a heater draws 5A current from a 240V supply, what is the potential on the neutral wire?

The correct option is A 0VPotential of a neutral wire is always zero and that's why it is called so. Whenever we say the potential of the appliance is V volts, we mean the potential of live wire.

If a heater draws $5 A$ current from a $240 V$ supply, what is the potential on the neutral wire?

The correct option is A $0 V$
Potential of a neutral wire is always zero and that's why it is called so. Whenever we say the potential of the appliance is $V$ volts, we mean the potential of live wire.