AC Power vs Frequency

Discussion in 'General Electronics Chat' started by mnada, Apr 25, 2012.

Apr 5, 2012
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I have a simple question that is bugging me. I know that AC power is I*V*cosθ. I cannot intuitively understand how frequency is not part of the power equation.
Say I have 2 sources rated at 110v and one of them is at 50Hz and the other is at 60Hz. How they are delivering the same power to a a resistive load?

Thanks,

2. Kermit2 AAC Fanatic!

Feb 5, 2010
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Picture a Power AC of 120V ONE HERTZ.

Now picture the positive power peak and the negative power peak.

They sweep out a coverage of one half.

Any given multiple of 50 or 60 or however many waves will still only sweep out 1/2 of the given time dimension.

Freq counts but not for total duration of power delivered per unit time.

3. Kermit2 AAC Fanatic!

Feb 5, 2010
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One half is not mathematically the correct ratio in dealing with the math of the subject though

4. crutschow Expert

Mar 14, 2008
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It true there are more cycles in one second from a 60Hz source as compared to a 50Hz source. But the mathematical average of the waveform doesn't change with the number of cycles per second and neither does the average power. How would it?