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8. A 50" television uses 140 watts of power. If it is on an average of 4.5 hours per
day, how many kWh will it use? At a cost of $0.105 per kWh, how much will it cost for
the year?

Respuesta :

MathPhys

Answer:

E = 0.63 kWh / day

C = $24.14 / yr

Explanation:

Energy is power times time. Using this formula, we can calculate the daily energy usage, the yearly energy usage, and the yearly cost.

The daily energy usage is:

E = Pt

E = (140 W) (4.5 hr/day)

E = 630 Whr / day

E = 0.63 kWh / day

The yearly energy usage is:

E = 0.63 kWh / day × 365 day/yr

E = 230 kWh / yr

The yearly cost is:

C = 230 kWh / yr × $0.105 / kWh

C = $24.14 / yr

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