To explain: the reason why incandescent light bulbs burn out more frequently just as they are switched on rather than while they are operating.
Explanation of Solution
Introduction:
When the light bulb is operating, the resistance of the bulb is reasonably large as it is hot. We know that the resistance varies inversely as the current. The current will be less in this case.
When the light bulb is off, then the resistance of the bulb is less as it is cold. As the resistance of the bulb is less, the sudden flow of current when it is just switched is enough to burn out the bulb.
Conclusion:
Hence, because the bulb’s resistance is smaller, the sudden current flow when it is just turned is adequate to flame the bulb out.
Chapter 22 Solutions
Glencoe Physics: Principles and Problems, Student Edition
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