Physics

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An electric lawn mower has a resistance of 160 ohms and draws 15A. What is the cost of operating the lawn mower for 30 minutes if electrical energy costs $0.12/kWh?

  • Physics - Not Sure -

    Voltage/Resistance = Current
    x/160 = 15
    x = (15)(160) V

    Power = Current*Voltage
    ==> (15)(15)(16) = 3600 Watts

    30 min = (30)(60) seconds

    ==> (3600)(30)(60) Watts for 30 min.
    ==> (3600)(30)(60)/(1000) = 6480 kWh

    ==> (6480)(.12) = $777.6

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