How much energy is transferred by five 60 watt bulb in 20 minutes

1 answer:

8 0

(5 bulbs)·(60 watts/bulb)·(20 minutes)·(1 joule per sec/watt)·(60 sec/minute)

= (5·60·20·1·60) (bulb·watt·minute·joule per sec·sec) / (bulb·watt·minute)

= 360,000 joules
_____________________________________________

Another way:

Five 60-watt bulbs = 300 watts = 0.3 kilowatt

20 minutes = 1/3 hour

(0.3 kilowatt) · (1/3 hour) = 0.1 kilowatt-hour

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The complete question is shown on the first uploaded image

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