Consider figures 25-21 and 25-22 on page 664 of the textbook. If fig. 25-21 is s

Q: Consider figures 25-21 and 25-22 on page 664 of the textbook. If fig. 25-21 is s

Frequency of the power variation is 120Hz in other words time between consecutive peaks in the power graph 1/120 s this is because in every half cycle in current graph it reaches 0. power is propotionate to I2 hence power should become zero twise in every current cycle, which gives the twise of frequecy that current is having.

ID: 1515109 • Letter: C

Question

Consider figures 25-21 and 25-22 on page 664 of the textbook. If fig. 25-21 is showing 60 Hz AC voltage in its lower panel, and fig. 25-22 is showing the power dissipated in a resistor in a 60 Hz AC circuit, what is the frequency of the power variation? Put another way, if the time between consecutive peaks in the voltage graph is 1/60 s; what is the time between consecutive peaks in the power graph? From a direct measurement personally made, I can assure that the time between consecutive peaks in the power graph is not 1/60 s.

Time (a) DC Time (b) AC FIGURE 25-21 (a) Direct current. (b) Alternating current

Explanation / Answer

Frequency of the power variation is 120Hz

in other words time between consecutive peaks in the power graph 1/120 s

this is because in every half cycle in current graph it reaches 0. power is propotionate to I2 hence power should become zero twise in every current cycle, which gives the twise of frequecy that current is having.

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Consider figures 25-21 and 25-22 on page 664 of the textbook. If fig. 25-21 is s

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Consider figures 25-21 and 25-22 on page 664 of the textbook. If fig. 25-21 is s

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