Concept explainers
Power dissipation in the cord.
Answer to Problem 38P
7.8 W
Explanation of Solution
Given:
Current,
Resistivity of copper,
Length,
Radius,
Formula used:
By the definition of the power,
Where,
By the ohm’s law, a new expression for electrical power will be
Where,
It is known that resistance:
Where,
Calculation:
By using the formula of power and resistance;
Substitute the given values
Conclusion: The required power is 7.8 W.
Chapter 18 Solutions
Physics: Principles with Applications
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