Physics, 17.09.2019 09:10, emmadivaburnsox7ae9

Alamp can work on 50v mains taking 2 amps. what value of resistance must be connected in series with it, so that it can be operated from 200v mains giving the same power?

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Alamp can work on 50v mains taking 2 amps. what value of resistance must be connected in series with...