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Homework Help: Cost of a energy from a battery

  1. Dec 4, 2008 #1
    A transistor radio operates by means of a 9.5 V battery that supplies it with a 58 mA current.

    (a) If the cost of the battery is $0.85 and it lasts for 300 h, what is the cost per kWh to operate the radio in this manner?
  2. jcsd
  3. Dec 4, 2008 #2


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    Science Advisor
    Homework Helper

    Re: um..

    You have to make an attempt at the question!
    How do you calculate Watts form volts and amps?
    What is a KWh?
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