Physics

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With a 1220–W toaster, how much electrical energy is needed to make a slice of toast (cooking time = 1.3 minute)?


At 12.1 cents/kW·h, how much does this cost? (You do not need to enter any units.)

  • Physics -

    energy= power*timeinsecond=1220*60*1.3 Joules

    cost=1.22Kw*1.3/60 hr * 12.1 cents/kwhr

  • Physics -

    1220 Joules/second * 1.3*60 seconds
    = 95,160 Joules

    1.220 kW * 1.3 min * 1 hr/60 min

    = .0264333333333..... kW h

    * 12.1 cents = .32 cents

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