Concept explainers
(a)
The voltage and current amplitudes for the light bulb connected to an ac generator.
Answer to Problem 80QAP
For the bulb connected to the ac generator, the voltage amplitude is found to be 13 V and the current amplitude is 1.53 A.
Explanation of Solution
Given:
Magnetic field applied
Number of turns
Length of a side of the square coil
Frequency of the generator
Resistance of the bulb
Formula used:
The voltage amplitude is given by the expression,
Here, A is the area of the square coil, given by,
Therefore,
The current amplitude is given by,
Calculation:
Substitute the known values of variables in equation (1) and calculate the voltage amplitude.
Calculate the current amplitude by substituting the value of R and the calculated value of
Conclusion:
Thus, for the bulb connected to the ac generator, the voltage amplitude is found to be 13 V and the current amplitude is 1.53 A.
(b)
The average rate at which heat is generated in the bulb connected to the ac generator.
Answer to Problem 80QAP
The average rate at which heat is generated in the bulb connected to the ac generator is 9.99 W.
Explanation of Solution
Given:
The current amplitude
Resistance of the bulb
Formula used:
The average rate at which heat is generated in the bulb is equal to the power dissipated by the bulb. This is given by,
Here,
Therefore,
Calculation:
Substitute the values of the variables in equation (3) and calculate the rate at which heat is generated in the bulb.
Conclusion:
Thus, the average rate at which heat is generated in the bulb connected to the ac generator is 9.99 W.
(c)
The energy consumed by the bulb every hour.
Answer to Problem 80QAP
The energy consumed by the bulb every hour is
Explanation of Solution
Given:
Average power
Time interval
Formula used:
The energy consumed by the bulb every hour is given by,
Calculation:
Substitute the values of variables in the formula and calculate the energy consumed in one hour.
Conclusion:
Thus, the energy consumed by the bulb every hour is
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Chapter 21 Solutions
COLLEGE PHYSICS
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