Question

an electric heater has a resistance of 150ohm and can bear maximum current of 1A. if the heater is to be used on 220V mains, the least resistance required in the circuit will be​

Answer 1

Explanation:

An electric heater has resistance 150hms and can bear a maximum current if 1 ampere. If the heater is to be used on 229vilt mains ,the least resistance required in the circuit will be

SOLUTION:

R=70ohm

given that the heater can bear a maximum current of 1ampere we need to add a resistance to the circuit in series with the heater so that current is less or equal to 1ampere

let the resistance be R

(150+R)×1=220

R=70 ohm

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