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A toaster is plugged into an 120-volt outlet. If it has a resistance of 460 ohms, how much power does it use?

A1,800 watts
B3.8 watts
C31 watts
D55,000 watts
E340 watts

Verified Answer :

AL2006

Here are a few formulas for electrical power:

 P  =  (voltage) x (current)

 P  =  (voltage)²  /  (resistance)

 P  =  (current)²  x  (resistance)

We know the voltage and the resistance, so it seems to me that
we should use the middle one.

      Power  =  (voltage)²  /  (resistance)

                 =  (120 volts)²  /  (460 ohms)

                 =  (14,400 volts²)  /  (460 ohms)

                 =  31.3 watts .


That's not much power for a toaster.  It produces about as much heat
as a small (30 watt) light bulb. 

You would not sell many toasters designed like this one, because
it would take several days to toast a slice of bread.

A toaster that has what it takes to do the job will typically use
1200 watts to 1600 watts, just like a typical blow-dryer.

leewhitmore160

Answer:

31 watts that's is my correct answer

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