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AC Circuits

# The standard wall voltage in the united states is

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Unformatted text preview: Vrms = I rms R Pavg = Vrms I rms = I r2ms R = Vr2 s m R When household or industrial electric voltage or current is referred to, the rms values are being cited. The standard “wall” voltage in the United States is either 110 VAC or 220 VAC (at 60 Hz). These are rms values. The peak voltage from a 110 VAC outlet is therefore Vmax = 156 V. Phase Consider instead the RC circuit, and the action of charging and discharging it over and over by magically reversing the battery over and over: R R + – I I +q – –q + C –q C +q The capacitor is discharged but then is immediately charged up again; however, the subsequent charging happens on the other plate. Note that at the initial charging moment the current is high, so the voltage across R is high, and the voltage across the capacitor is low. After a characteristic time RC, the voltage across C is higher and going to its maximum, and the current is going to zero, so the...
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