Concept explainers
(a)
The power consumption at the instant lightbulb is turned ON.
(a)
Answer to Problem 74GP
Explanation of Solution
Given:
Voltage,
Resistance (when cold),
Resistance (when hot),
Formula used:
Where,
Also,
Where,
Calculation:
When the lightbulb is just turned ON, its temperature is cool
So, the power is:
Conclusion: The required power is
(b)
The power consumption after a few moments when lightbulb is hot.
(b)
Answer to Problem 74GP
Explanation of Solution
Given:
Voltage,
Resistance (when cold),
Resistance (when hot),
Formula used:
Where,
Also,
Where,
Calculation:
When the lightbulb is just turned ON for a while, its temperature is hot. This means that its resistance is
So, the power is:
Conclusion: The required power is
Chapter 18 Solutions
Physics: Principles with Applications
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