Question: A lamp can work on a 50 volt mains taking 2 amps. What value of the resistance must be connected in series with it

A lamp can work on a 50 volt mains taking 2 amps.

A lamp can work on a 50 volt mains taking 2 amps. What value of the resistance must be connected in series with it so that it can be operated from 200 volt mains giving the same power.

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