Question

which uses more energy a 250 w tv set in 1hour or a 1200 w toaster in 10 min

Answer 1

1200 w toaster in 20 mins
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Answer 2

E= IsquareRT
For tv,
E= 250w * 1. (since P= Isquare r)
E= 250w = 0.25 kwh

For toaster,
E= 1200 * 10/60 ( since, 1 hr= 60mins)
E= 200 W = 0.2 kwh

Therefore, tv consumes more energy