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phy22 - Chapter 21 Alternating Current Circuits and...

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1 Chapter 21 Alternating Current Circuits and Electromagnetic Waves 21.1 Resistors in an AC circuit AC circuit ac power source V = V max sin(2 ft) It changes with time t. f is the frequency (60 Hz in the US, Canada and a few other countries with close ties to the US; 50Hz in Europe and most other countries) All powers we see on things (e.g., light bulbs) are average powers : P av = i 2 R = ½ (I max ) 2 R
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