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A printer has a power of 100 W. It takes 30 seconds to print out a document. How much energy will it
have used?

Answer :

100W translates to 100 watts consumed in 1 hour. Assuming the printer consumes electrical energy at a steady rate, then: 100 ÷ 60 = 1.6667 watts per minute. 1.6667 ÷ 2 = 0.8333 watts consumed in 30 seconds.