If it takes 15 minutes to dry your hair with a 1.200 kw hair drier, how much energy is used in drying your hair?
a. 0.300 kwh
b. 1.200 kwh
c. 1.800 kwh
d. 18.000 kwh

Option (A) is the correct answer.

Explanation:

The given data is as follows.

     Power = 1.200 kW,         Time = 15 minutes = = 0.25 hour

     Energy = ?

Thus, calculate the energy by using the formula as follows.

               Power =

               Energy = Power × Time

                            = 1.200 kW × 0.25 hr

                            = 0.300 kWh

Thus, we can conclude that 0.300 kWh energy is used in drying your hair.

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the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it