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10-04-2020
Physics

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The total amount of electrical energy used by a 315-watt television during 30.0 minutes of operation is

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10-04-2020

answer

567000 J

formula

the formula for power is P = ΔE/Δt

rearrange for energy to get ΔE = PΔt

P is power in watts (W)

E is energy in joules (J)

t is time in seconds (s)

values

P = 315 W

t = 30 minutes = 30 * 60 = 1800 s

plug in values

ΔE = PΔt

ΔE = 315 * 1800

ΔE = 567000 J

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