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# In periods of peak demand, power companies lower their ISBN: 9780321909107 29

## Solution for problem 10P Chapter 23

Conceptual Physics | 12th Edition

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Problem 10P

In periods of peak demand, power companies lower their voltage. This saves them power (and saves you money!). To see the effect, consider a 1200-W coffeemaker that draws 10 A when connected to 120 V. Suppose the voltage is lowered by 10% to 108 V. By how much does the current decrease? By how much does the power decrease? (?Caution:? The 1200-W label is valid only when 120 V is applied. When the voltage is lowered, it is the resistance of the toaster, not its power, that remains constant.)

Step-by-Step Solution:

Solution 10P Step 1: 2 The equation for electric power, P = H/t = I R Where, H - Heat produced t - Time of current flow I - Amount of current flowing through the circuit R - resistance offered by the circuit Ohm’s law states that, V = IR, Where “V” is the voltage in the circuit. Step 2: Resistance of the coffee maker, R = V / I Provided, if V = 120 V, I = 10 A Therefore, R = 120 V / 10 A = 12

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##### ISBN: 9780321909107

This full solution covers the following key subjects: power, voltage, much, saves, lowered. This expansive textbook survival guide covers 45 chapters, and 4650 solutions. Conceptual Physics was written by and is associated to the ISBN: 9780321909107. Since the solution to 10P from 23 chapter was answered, more than 341 students have viewed the full step-by-step answer. The answer to “In periods of peak demand, power companies lower their voltage. This saves them power (and saves you money!). To see the effect, consider a 1200-W coffeemaker that draws 10 A when connected to 120 V. Suppose the voltage is lowered by 10% to 108 V. By how much does the current decrease? By how much does the power decrease? (?Caution:? The 1200-W label is valid only when 120 V is applied. When the voltage is lowered, it is the resistance of the toaster, not its power, that remains constant.)” is broken down into a number of easy to follow steps, and 89 words. This textbook survival guide was created for the textbook: Conceptual Physics, edition: 12. The full step-by-step solution to problem: 10P from chapter: 23 was answered by , our top Physics solution expert on 04/03/17, 08:01AM.

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