A `20` volts `5` watt lamp(lamp to be treated as a resistor) is used on `AC` mains of `200` volts
Channel: Doubtnut
Date: 2020-01-26

A `20` volts `5` watt lamp(lamp to be treated as a resistor) is used on `AC` mains of `200` volts and `50/pisqrt11 c.p.s` Calculate the (i)capacitance of the capacitor, or inductance of the inductance, to be put in series to run the lamp.(ii)How much pure resistance should be included in place of the above device so that the lamp can run on its rated voltage.(iii)which is more economical (the capacitor the inductor or the resistor).