joe asked in Science & MathematicsPhysics · 8 months ago

I need help for my physics question very confused ?

So the question goes like this. Your family decides to charge you 4.0 cents/ (kW- h) for watching programs

on television. If the television set is rated at 125 W, how long can you watch for

5 cents?. 

I know the answer is 10 hours but How do I get to that answer any help is greatly appreciated

2 Answers

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  • Anonymous
    8 months ago

    5 cents / 4 cents/kwh = 1.25 kwh = 1250 wh

    1250 wh / 125 w = 10 h

  • 8 months ago

    So 4¢ per kW-h= 1¢ per 250 W-h.

    So 5¢=5 times 250=1,250 W-h total energy usage.

    Since the TV consumes 125 W, 1,250 W-h/125 W=10 hr.(s)

    (The W's cancel each other out.)

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