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

Answer

The energy consumed by T.V. set is more than that consumed by heater.

Explanation

For T.V. set : Power = 500 W, Time = 30 min = `30xx60s`
`therefore" Energy "="Power"xx"time"`
`E_(1)=500xx30xx60=900xx10^(3)J`
For heater: Power = 600W,
Time = 20 min = `20xx60s`
`therefore" Energy "(E_(2))=600xx20xx60=720xx10^(3)J`
Comparing `E_(1) and E_(2), E_(1)gt E_(2)`
`therefore" Energy spend by T.V. set "(E_(1))` is greater.