Answered: Calculate the power of a hair dryer…

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter28: Current And Resistance

Section: Chapter Questions

Problem 57PQ

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Question

Calculate the power of a hair dryer that operates on 120 V and draws a current of 10 A.

Expert Solution

Step 1

Power can be said to be the amount of energy that is supplied to an object within a unit amount of time. This energy is used to change the state of the electrical device using it.

The power can be written as

$P = V \times I$

where V=voltage applied, and I= current in the circuit.

Step 2

The power of the hand dryer is given by

$P = V \times I$

Putting the values we have

$\begin{array}{rcl} P & = & V \times I \\ = & 120 V \times 10 A \\ = & 1200 W \\ = & 1.2 kW \end{array}$

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