Inductance with Losses

This lecture covers the concept of inductance with losses, discussing the equivalent representation with a parallel diagram and the conditions for two models to be equivalent. It also explains the importance of the quality factor in series resonant circuits, demonstrating the behavior of the circuit at resonant frequency and the definition of quality factors. Additionally, it explores the bandwidth of the circuit and the receiver response, emphasizing the significance of the quality factor. Practical examples are provided to calculate the total quality factor of a circuit and analyze the complex current in resonant series. The lecture concludes with a detailed explanation of the quality factor's role in tuning circuits and its impact on circuit behavior.

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EE-111: Circuits and systems

Ce cours présente une introduction à la théorie et aux méthodes d'analyse et de résolution des circuits électriques.

RLC circuit

An RLC circuit is an electrical circuit consisting of a resistor (R), an inductor (L), and a capacitor (C), connected in series or in parallel. The name of the circuit is derived from the letters that are used to denote the constituent components of this circuit, where the sequence of the components may vary from RLC. The circuit forms a harmonic oscillator for current, and resonates in a manner similar to an LC circuit. Introducing the resistor increases the decay of these oscillations, which is also known as damping.

Linear circuit

A linear circuit is an electronic circuit which obeys the superposition principle. This means that the output of the circuit F(x) when a linear combination of signals ax1(t) + bx2(t) is applied to it is equal to the linear combination of the outputs due to the signals x1(t) and x2(t) applied separately: It is called a linear circuit because the output voltage and current of such a circuit are linear functions of its input voltage and current. This kind of linearity is not the same as that of straight-line graphs.

LC circuit

File:LC parallel simple.svg|LC circuit diagram File:Low cost DCF77 receiver.jpg|LC circuit ''(left)'' consisting of ferrite coil and capacitor used as a tuned circuit in the receiver for a [[radio clock]] File:Tuned circuit of shortwave radio transmitter from 1938.jpg|Output tuned circuit of [[shortwave]] [[radio transmitter]] An LC circuit, also called a resonant circuit, tank circuit, or tuned circuit, is an electric circuit consisting of an inductor, represented by the letter L, and a capacitor, represented by the letter C, connected together.

Q factor

In physics and engineering, the quality factor or Q factor is a dimensionless parameter that describes how underdamped an oscillator or resonator is. It is defined as the ratio of the initial energy stored in the resonator to the energy lost in one radian of the cycle of oscillation. Q factor is alternatively defined as the ratio of a resonator's centre frequency to its bandwidth when subject to an oscillating driving force. These two definitions give numerically similar, but not identical, results.

Electrical resonance

Electrical resonance occurs in an electric circuit at a particular resonant frequency when the impedances or admittances of circuit elements cancel each other. In some circuits, this happens when the impedance between the input and output of the circuit is almost zero and the transfer function is close to one. Resonant circuits exhibit ringing and can generate higher voltages or currents than are fed into them. They are widely used in wireless (radio) transmission for both transmission and reception.

AC Circuits Analysis: Maxwell's Equations to Impedance PHYS-201(d): General physics: electromagnetism

Explores AC circuits analysis, from Maxwell's equations to impedance and experimental phase shifts verification.

Electromagnetism: UNIL-208

Covers Lenz's law, induced voltage, and electromagnetic circuits.