When we attach electrically charged capacitors to inductors, the charge on the capacitors and the electric current on the electric circuit go through LC oscillations. The mechanism continues at a distinct frequency, and if no resistance exists in the LC circuits, then the LC Oscillations will be there indefinitely. These circuits are called LC oscillators. Just like a normal LC circuit, in an LC oscillator, there will be a minimum of one capacitor (capacitance C) and one inductor (inductance L). The capacitor will be completely charged with change Q0. The inductor and the capacitor will be connected in an end-to-end way.
LC Oscillations Questions and Answers
1) What is an LC circuit?
An LC circuit is a type of electric circuit which is composed of a capacitor, denoted by the symbol C and an inductor, denoted by the symbol L, linked together. It is also called a tuned circuit, resonant circuit, or tank circuit.
2) What are the main uses of LC circuits?
LC circuits are used either for producing signals at a targeted frequency or choosing a signal at a specific frequency from a more complicated signal. This function is known as a bandpass filter. LC circuits are the main components in numerous electronic devices, especially radio tools, employed in circuits such as filters, frequency mixers, oscillators and tuners.
3) What is an LC oscillation?
When we attach electrically charged capacitors to inductors, the charge on the capacitors and the electric current on the electric circuit go through LC oscillations.
4) What are the applications of LC Oscillations?
- Many electrical pieces of equipment, such as radio devices, filters, transmitters, TVs, RF generators, frequency mixers, etc., utilise LC oscillations.
- In order to transform a DC signal into an AC signal, an LC oscillator is used. Such a resonance circuit may also be employed to increase voltage.
- It is also used to produce a signal with a targeted frequency by regulating the capacitance and inductance levels.
- They are also perfect for induction heating.
5) Why does an LC circuit oscillate?
When charged capacitors are attached to de-energised inductors, the capacitors will start charging the inductors while discharging themselves, and the inductors will carry out the same when fully activated, and the capacitors are fully discharged. Due to this, a short current oscillation happens here.
6) What is the main use of LC oscillators?
Most of the time, LC oscillators are used to produce a certain frequency.
7) What is the frequency of LC oscillation?
The frequency of LC oscillation is found using the following equation:
f = 1/2π √LC
It depends on the inductance (L) and capacitance (C) quantities.
8) Why are LC oscillations considered non-realistic?
LC oscillations are considered non-realistic because the capacitor and inductor are noticeably non-ideal; they will possess specific resistance in them in reality. Due to this, an amount of energy is dissipated in the resistance with each individual LC oscillation cycle, and it can’t continue indefinitely.
9) What is an inductor?
It is a passive electrical component which is designed to accumulate magnetic energy when electricity is exerted on it.
10) What is a capacitor?
A capacitor is a two-end device that has the capability to store energy in the form of electric charges.
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Practice Questions
1) What is meant by an oscillator?
2) What are the different types of circuits?
3) What is the main difference between a capacitor and an inductor?
4) What are the advantages of LC oscillators?
5) What is the relationship between an inductor and an LC circuit?
6) What is the principle behind an LC oscillator?
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