Physics
Textbooks
Boundless Physics
Induction, AC Circuits, and Electrical Technologies
Physics Textbooks Boundless Physics Induction, AC Circuits, and Electrical Technologies
Physics Textbooks Boundless Physics
Physics Textbooks
Physics

Section 2

AC Circuits

Book Version 3
By Boundless
Boundless Physics
Physics
by Boundless
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8 concepts
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Inductance

Induction is the process in which an emf is induced by changing magnetic flux, such as a change in the current of a conductor.

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RL Circuits

An RL circuit consists of an inductor and a resistor, in series or parallel with each other, with current driven by a voltage source.

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RLC Series Circuit: At Large and Small Frequencies; Phasor Diagram

Response of an RLC circuit depends on the driving frequency—at large enough frequencies, inductive (capacitive) term dominates.

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Resistors in AC Circuits

In a circuit with a resistor and an AC power source, Ohm's law still applies (V = IR).

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Capacitors in AC Circuits: Capacitive Reactance and Phasor Diagrams

The voltage across a capacitor lags the current. Due to the phase difference, it is useful to introduce phasors to describe these circuits.

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Inductors in AC Circuits: Inductive Reactive and Phasor Diagrams

In an AC circuit with an inductor, the voltage across an inductor "leads" the current because of the Lenz' law.

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Resonance in RLC Circuits

Resonance is the tendency of a system to oscillate with greater amplitude at some frequencies—in an RLC series circuit, it occurs at $\nu_0 = \frac{1}{2\pi\sqrt{LC}}$.

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Power

Power delivered to an RLC series AC circuit is dissipated by the resistance in the circuit, and is given as $P_{avg} = I_{rms} V_{rms} cos\phi$. Here, $\phi$ is called the phase angle.

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