How much energy will be spent in $15$ minutes in a $5$ kilowatt electric heater?

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Solution

Power of heater $P = 5 k W = 5000 W = 5000 \frac{J}{s}$
Time of operation $t = 15 m i n = 15 \times 60 = 900 s$
Thus energy spent $E = P t = 5000 \times \frac{J}{s} \times 900 s = 4.5 \times 10^{6} J$

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How much energy will be spent in 15 minutes in a 5 kilowatt electric heater?

Power of heater P=5 kW=5000 W=5000 JsTime of operation t=15 min=15×60=900 sThus energy spent E=Pt=5000×Js×900 s=4.5×106 J

How much energy will be spent in $15$ minutes in a $5$ kilowatt electric heater?

Power of heater $P = 5 k W = 5000 W = 5000 \frac{J}{s}$
Time of operation $t = 15 m i n = 15 \times 60 = 900 s$
Thus energy spent $E = P t = 5000 \times \frac{J}{s} \times 900 s = 4.5 \times 10^{6} J$