Concept explainers
(a)
The power wasted in copper wire.
(a)
Answer to Problem 80GP
Explanation of Solution
Given:
Power
Voltage
Resistivity of copper,
Length,
Diameter,
Formula used:
By the definition of the power,
Where,
By the ohm’s law, a new expression for electrical power will be
Where,
Resistance:
Where,
Calculation:
By using the formula of power dissipated and a resistance;
So,
Substitute the given values:
Conclusion:
The power wasted in
(b)
The power wasted in copper wire.
(b)
Answer to Problem 80GP
The answer is
Explanation of Solution
Given:
Power
Voltage
Resistivity of copper,
Length,
Diameter,
Formula used:
Power dissipated in a resistance:
Where,
It is known that resistance:
Where,
Calculation:
By using the formula of power dissipated and a resistance;
So,
Substitute the given values:
Conclusion: The required power is
Chapter 18 Solutions
Physics: Principles with Applications
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