An electric heater has resistance 150 ohms and can bear a maximum current of 1 ampere. If the heater is to be used on 220 volt mains, the least resistance required in the circuit will be

70

ohms

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5 ohms

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2.5 ohms

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1.4 ohms

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Solution

The correct option is B $70$ ohms
Given that the heater can bear a maximum current of 1 ampere we need to add a resistance to the circuit in series with the heater so that current is less or equal to 1 ampere.
Let that resistance be R, then $(150 + R) \times 1 = 220$
$R = 70$ ohm

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An electric heater has resistance 150 ohms and can bear a maximum current of 1 ampere. If the heater is to be used on 220 volt mains, the least resistance required in the circuit will be

The correct option is B 70 ohmsGiven that the heater can bear a maximum current of 1 ampere we need to add a resistance to the circuit in series with the heater so that current is less or equal to 1 ampere.Let that resistance be R, then (150+R)×1=220R=70 ohm

The correct option is B $70$ ohms
Given that the heater can bear a maximum current of 1 ampere we need to add a resistance to the circuit in series with the heater so that current is less or equal to 1 ampere.
Let that resistance be R, then $(150 + R) \times 1 = 220$
$R = 70$ ohm