Question

How much energy does a 50 W bulb consume in four hours?

Enter your answer in terms of kJ. Don't write down the unit.

Answer 1

Answer:

The power company bills you on Watts consumed (Kilowatt Hours). A Kilowatt Hour is 1000 watts per hour. So a 40 watt light bulb (if rated at the Voltage of 110 volts) would use 40 watts per hour.

Answer 2

Energy consumed in 4 hours is 720 J.

We know, Watt ( W ) is the ratio of work done in Joule by time taken in seconds.

Therefore, energy consume by 50 W bulb in one hour , $E = W\times time(in\ seconds)=50\times 60\times 60=1.8\times 10^{5}\ J=180\ J.$

So, energy consumed by 50 W bulb in one hour is , E = 180 J.

Therefore, energy consumed in 4 hours = $180\times 4\ J= 720\ J.$

Hence, this is the required solution.

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