31. Alternating Current

Phasors for Capacitors

Capacitors in AC Circuits with Phasors | Doc Physics

Phasor Relationship for Capacitor

Phasor in Capacitor and Inductor

Phasor representation of capacitor

a) imax = 4.2A b) θiC = 115o θVC = 185o

a) imax = 4.2A b) θiC = 185o θVC = 115o

a) imax = 4.2A b) θiC = 115o θVC = 25o

a) imax = 4.2A b) θiC = 25o θVC = 115o

An AC source operates at a maximum voltage of 60 V and is connected to a 0.7 mF capacitor. If the current across the capacitor is i(t) = iMAX cos[(100 s−1 )t],&nbsp;a) What is iMAX?&nbsp;b) Draw the phasors for voltage across the capacitor and current in the circuit at t = 0.02 s. Assume that the current phasor begins at 0°.

A capacitor is connected across an ac source that has voltage amplitude 60.0 V and frequency 80.0 Hz. (b) What is the capacitance C of the capacitor if the current amplitude is 5.30 A?

Transforming capacitors to the phasor domain

A capacitance C and an inductance L are operated at the same angular frequency. (a) At what angular frequency will they have the same reactance? (b) If L = 5 00 mH and C = 3.50 μF, what is the numerical value of the angular frequency in part (a), and what is the reactance of each element?

Example Simple Voltage current across capacitor using Phasors

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