Calculate the amount of heat produced  per second (in calories ) when a bulb of `100 W ,
Channel: Doubtnut
Date: 2020-08-23

Calculate the amount of heat produced  per second (in calories ) when a bulb of `100 W ,220 W` glows, assuming that only `20 %` of electric energy is connected into light `J = 4.2 J cal^(-1)`