Bulb

A 60 W bulb consumes 0.12 kWh of electricity. How long did she stand light without a break?

Result

t =  2 h

Solution:

P=60 W W=0.12 1000=120 Wh t=W/P=120/60=2 hP=60 \ \text{W} \ \\ W=0.12 \cdot \ 1000=120 \ \text{Wh} \ \\ t=W/P=120/60=2 \ \text{h}



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