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

Answer»


Solution :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.


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