Who will spend more electrical energy ? 500 W TV set in 30 minutes, or 600 W heater in 20 minutes ?

Explanation

Data : ` P_(1) = 500 W, t_(1) = 30 min = 30/60 h = P_(2) = 600 W, `
` t_(2) = 20 min = 20/60 h`
Electrical energy used = pt
TV set : ` P_(1)t_(1) = 500 W xx 30/60 h`
` 500/2 W.h = 250 W.h`
Heater : `p_(2)t_(2) = 600 W xx 20/60 h = 200 W.h `
Thusm the TV set will spend electrical energy than the heater.