Make an order-of-magnitude estimate of the cost of oneperson\'s routine use of a

Question

Make an order-of-magnitude estimate of the cost of oneperson's routine use of a hair dryer for 1 yr. If you do not use ablow dryer yourself, observe or interview someone who does. Statethe quantities you estimate and their values. (Assume that the hairdryer will use about 400 W of power for 10 minutes each day of theyear and that the cost for electrical energy is approximately 10cents per kilowatt-hour).

$10 _________ / year Make an order-of-magnitude estimate of the cost of oneperson's routine use of a hair dryer for 1 yr. If you do not use ablow dryer yourself, observe or interview someone who does. Statethe quantities you estimate and their values. (Assume that the hairdryer will use about 400 W of power for 10 minutes each day of theyear and that the cost for electrical energy is approximately 10cents per kilowatt-hour).

$10 _________ / year

Explanation / Answer

power P = 400 W time used in one day t = 10 min = 10 / 60 h energy used in one day E = P t                                       = 66.6666 W h energy used in 1 year = E * 365                                 = 24333.333 W h                                 = 24.333333 kW h So, cost = 24.33333 * 10 cents              = 243.3333 cents

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