
Concept explainers
The current through the bulb using Kirchhoff’s loop rule.

Answer to Problem 47A
The current through the bulb is
Explanation of Solution
Given:
The resistance of the bulb is
Formula used:
The expression for the resistance is,
Here,
Calculation:
Given that a flashlight has three batteries, in which one of the batteries is put in backward.
The potential increase in battery, using Kirchoff’s loop rule, is
The current through the bulb is,
Conclusion:
Thus, the current through the bulb is
Chapter 23 Solutions
Glencoe Physics: Principles and Problems, Student Edition
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