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26/09/2021 8:59 pm
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Which uses more energy, a 250 W TV set in 1 hr or a 1200 W toaster in 10 minutes?
1 Answer
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26/09/2021 9:03 pm
Energy used by TV set = Power x Time
= \(\frac{250}{1000}\) x 1 [∵ 250 W = \(\frac{250}{1000}\) kW]
= 0.25 kWh
Energy used by toaster = Power x Time
= \(\frac{1200}{1000}\) x \(\frac{10}{60}\)
= \(\frac{2}{10}\) = 0.2 kWh
Hence, TV set uses more energy in 1 hr.