# Physics

posted by Joe

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.)

1. bobpursley

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

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

2. Damon

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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