A blow-dryer and a vacuum cleaner each operate with a voltage of120 V. The curre

Question

A blow-dryer and a vacuum cleaner each operate with a voltage of120 V. The current rating of the blow-dryer is 9 A, and that of the vacuum cleaner is 3.0 A. (a) Determine the power consumed by theblow-dryer.
1 W

(b) Determine the power consumed by the vacuum cleaner.
2 W

(c) Determine the ratio of the energy used by the blow-dryer in19 minutes to the energy used by thevacuum cleaner in one-half hour.
Ebd / Evc = 3 (a) Determine the power consumed by theblow-dryer.
1 W

(b) Determine the power consumed by the vacuum cleaner.
2 W

(c) Determine the ratio of the energy used by the blow-dryer in19 minutes to the energy used by thevacuum cleaner in one-half hour.
Ebd / Evc = 3

Explanation / Answer

(1).  the power consumed by the blow-dryer P = Vi                                                                        = 120 * 14= 1680 W (2)  the power consumed by the vacuum cleaner P ' = 120 * 4.5                                                                               = 540 W (3). the ratio of the energy used by the blow-dryer in15 minutes to the energy used by thevacuum cleaner in one-half hour      is = Pt / P't'          = ( 1680 W *15 min ) / ( 540 W * 30 min )          = 1.555

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