Chapter 18.2, Problem 18.4QQ

College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

Chapter
Section

College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

The circuit in Figure 18.5 consists of two resistors, a switch, an ammeter, and a battery. When the switch is closed, power Pc is delivered to resistor R1. When the switch is opened, which of the following statements is true about the power Po delivered to R1? (a) Po < Pc (b) Po = Pc (c) Po > PcFigure 18.5 (Quick Quizzes 18.3 and 18.4)

To determine
The power delivered to R1 when the switch is open.

Explanation

Given Info: The power delivered to the resistor R1 when the switch is closed is Pc . The power delivered to the resistor R1 when the switch is open is Po .

Explanation:

The expression of power is,

P=I2R

• P is the power dissipated by the resistor,
• I is the current through the resistor,
• R is the resistance of the resistor,

When the circuit is closed, the current bypass the resistor R2 by flowing through the closed switch and reaches ammeter through the resistor R1 alone

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