A blow dryer transfers 2.5 kilojoules in 20 seconds.Calculate the power of this blow dryer.Give your answer in watts. Make sure to include the units in your answer.0.125125W50W12.5W125
Question
A blow dryer transfers 2.5 kilojoules in 20 seconds.Calculate the power of this blow dryer.Give your answer in watts. Make sure to include the units in your answer.0.125125W50W12.5W125
Solution
The power of an appliance is calculated using the formula:
Power (P) = Energy transferred (E) / Time taken (t)
Given that the energy transferred is 2.5 kilojoules and the time taken is 20 seconds, we can substitute these values into the formula.
But first, we need to convert the energy from kilojoules to joules because the standard unit of energy in the International System of Units (SI) is the joule (J).
1 kilojoule (kJ) = 1000 joules (J)
So, 2.5 kJ = 2.5 * 1000 J = 2500 J
Now, we can substitute these values into the formula:
P = 2500 J / 20 s = 125 W
So, the power of the blow dryer is 125 watts.
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