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Reading Keith`s posting, somebody wrote:
"The power is Vavg"Iavg"cos(theta)" This is mistaken. The average value of a sine wave is 0.637 times the peak value. We use 0.707 toimes the peak value of a sine wave, the rms value, which is the effective value, that is, it is as effective as d-c in making power calculations. The average power must be the same as d-c. This is peak volts times peak amps divided by two, or 1/2 the peak power. 0,707 x 0.707 = 0.5, so we use rms, not avg. volts and amps to calculate average power, which is the same in capability when producing light and heat from resistive devices. Best regards, Richard Harrison, KB5WZI |
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