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Which uses more energy, a 250 W TV set in 1 hr, or a 1200 W toaster in 10 minutes?

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NCERT Question 16 Which uses more energy, a 250 W TV set in 1 hr, or a 1200 W toaster in 10 minutes? Power of TV = P1 = 250 W Time taken by TV = t1 = 1 hour = 60 Γ— 60 seconds = 3600 seconds Power of toaster = P2 = 1200 W Time taken by toaster = t2 = 10 minutes = 10 Γ— 60 seconds = 600 seconds We know that Power = πΈπ‘›π‘’π‘Ÿπ‘”π‘¦/π‘‡π‘–π‘šπ‘’ ∴ Energy = Power Γ— Time TV set Energy = P1 Γ— t1 = 250 Γ— 3600 = 900000 J = 9 Γ— 105 J Toaster Energy = P2 Γ— t2 = 1200 Γ— 600 = 720000 J = 7.2 Γ— 105 J ∴ Energy consumed by TV is more.

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo