Oscillations and AC Circuits

Online lecture videos recorded by Prof. Darin Acosta
Use of these videos for teaching purposes requires the explicit consent of Prof. Dain Acosta

Note: We won't be using the concept of phasors in these lectures. Rather we will rely on graphs of trigonometric functions versus time to explain concepts of leading or lagging (i.e. what you might see on an oscilloscope trace).

LC Circuits

Lecture (20:48)
- Discussion of the solutions for the current and charge in an LC circuit, which oscillate sinusoidally, and the conservation of energy in such a circuit

RLC Circuits and Damped Oscillations

Lecture (13:55)
- Discussion and graphing of the solution for the charge on a capacitor in an RLC circuit, which undergoes damped harmonic oscillation

Alternating Current

Lecture (6:48)
- Concept of alternating current and EMF, with demonstration

Resistance and Reactance

Lecture (22:56)
- Discussion of resistive, capacitive, and inductive loads in AC circuits and concepts of reactance and phase

Damped, Driven RLC Circuits

Solution for Current (11:52)
- Discussion of the solution to the current in a driven RLC circuit
Resonance in Driven RLC circuits (14:00)
- Resonance phenomenon in a driven RLC circuit
Phase in Driven RLC circuits (7:14)
- Phase of the current with respect to the EMF in a driven RLC circuit
Real RLC circuit demonstration (12:17)

Dual view in Mediasite, swap between views
Demonstration of a driven RLC circuit using an oscilloscope to view the EMF and current amplitudes, frequencies, and phase differences.

Power in AC Circuts

Lecture (17:25)
- Calculating the average power dissipated in AC circuits

Transformers

Lecture (22:43)
- Discussion on how a transformer works with AC circuits to step up or down the voltage, including a demonstration