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Home Q & A Board Science-Related Homework Help Physics
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Argentina Argentina
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6 years ago
A 1200 W hair dryer used for 10 minutes uses as much energy as a 1000 W hair dryer run 12 minutes.
 
  What will be an ideal response?
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#1
6 years ago
This is correct: the power of 1200 W in the first case used for 10 min (600 s),
giving an energy use PDt = (1200 W)(600 s) = 720,000 J. In the second case, the power is
1000 W but the time is 12 min (720 s), giving an energy use of PDt = (1000 W)(720 s) =
720,000 J, exactly the same.
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