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Unformatted text preview: AC Circuits AC Circuit The output of an AC generator is sinusoidal and varies with time according to the following equation is the instantaneous voltage is the peak or maximum emf. is the angular frequency. f is the frequency and T is the period Phasor diagrams are useful vectorial representations T 2 f 2 = = t cos = Resistor Circuits The resistor voltage v R where V R is the peak or maximum voltage. The current through the resistor is where I R = V R / R is the peak current. The potential decreases in the direction of the current. Using Kirchhoffs loop law v V V V R R source = = + = Capacitor Circuits a current i c charging a capacitor with capacitance C . the instantaneous capacitor voltage is v c = q/C . When the capacitor is connected across an AC source of emf : v c = = cos t. In a more useful form where Vc is the peak or maximum voltage across the capacitor....
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 Spring '08
 drake
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