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Unformatted text preview: Chapter 23 Alternating Current Circuits 23.1 Capacitors and Capacitive Reactance The resistance in a purely resistive circuit has the same value at all frequencies. R I V rms rms = 23.1 Capacitors and Capacitive Reactance C X I V rms rms = fC X C π 2 1 = capacitive reactance 23.1 Capacitors and Capacitive Reactance Example 1 A Capacitor in an AC Circuit The capacitance is 1.50μF and the rms voltage is 25.0 V. What is the rms current when the frequency is (a) 100 Hz and (b) 5000 Hz? 23.1 Capacitors and Capacitive Reactance A 0236 . 1060 V . 25 rms rms = Ω = = C X V I ( 29 ( 29 Ω = × = = 1060 F 10 50 . 1 Hz 100 2 1 2 1 6 π π fC X C (a) (b) ( 29 ( 29 Ω = × = = 2 . 21 F 10 50 . 1 Hz 5000 2 1 2 1 6 π π fC X C A 18 . 1 21.2 V . 25 rms rms = Ω = = C X V I 23.1 Capacitors and Capacitive Reactance For a purely resistive circuit, the current and voltage are in phase . 23.1 Capacitors and Capacitive Reactance The current in a capacitor leads the voltage across the capacitor by a phase angle of 90 degrees....
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 Summer '09
 Uscinski
 Inductor

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