31. Alternating Current

Capacitors in AC Circuits

Capacitors in AC Circuits (Impedance)

AC Through Pure Capacitance Alone [Year- 1]

The peak current to and from a capacitor is i when the emf source has a peak voltage V and frequency f. What is the peak current to and from the capacitor if the frequency and peak voltage are doubled to 2f and <math display='inline'><mrow><mn>2</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">V</mi></mrow></math>, respectively?

RLC Circuits (4 of 19) Capacitive Reactance; Phase Shift, Phasor Diagrams, Frequency, An Explanation

<p>A 300 µF capacitor is connected to an AC source operating at an RMS voltage of 120 V. If the maximum current in the circuit is 1.5 A, what is the oscillation frequency of the AC source?</p>

A low-pass RC filter has a <math display='inline'><mrow><mn>10</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">k</mi><mo mathvariant="normal" class="MathML-Unit">&#x03A9;</mo></mrow></math> resistor in series with a <math display='inline'><mrow><mn>450</mn><mo rspace="thickmathspace">&#x2062;</mo><mo mathvariant="normal" class="MathML-Unit">&#x03BC;</mo><mi mathvariant="normal" class="MathML-Unit">F</mi></mrow></math> Capacitor. What is the crossover angular frequency?

Anderson Video - Capacitor Reactance

AC Circuit:  Resistor and a Capacitor in series

An AC circuit consists of a <math display='inline'><mrow><mn>20</mn><mo rspace="thickmathspace">&#x2062;</mo><mo mathvariant="normal" class="MathML-Unit">&#x03BC;</mo><mi mathvariant="normal" class="MathML-Unit">F</mi></mrow></math> capacitor and an emf source with a peak voltage of 40 V. What is the frequency of the source if the peak current is <math display='inline'><mrow><mn>430</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">mA</mi></mrow></math>?

capacitor in ac circuit

Anderson Video - Capacitor in AC Circuit

Current in a Parallel RC AC Circuit

<p>An AC source operates at a maximum voltage of 120 V and a frequency of 60 Hz. If it is connected to a 175 µF capacitor, what is the maximum charge stored on the capacitor?</p>

AC circuit containing only capacitor ( ⚡3d animation )

Anderson Video - Capacitor Circuit Example

An AC circuit consists of a capacitor and an emf source with frequency <math display='inline'><mrow><mn>0.25</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">Hz</mi></mrow></math>. If the source is turned on at <math display='inline'><mrow><mi>t</mi><mo>=</mo><mn>0</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">s</mi></mrow></math>, and the first time the voltage across the capacitor reaches a maximum value is at <math display='inline'><mrow><mi>t</mi><mo>=</mo><mn>1.4</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">s</mi></mrow></math>, when is the first time the current in the capacitor is at a maximum?

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