Important Topic of Physics: RL Circuit

# Important Topic of Physics: RL Circuit

The resistor (R), capacitor (C), and inductor (L) are the three basic passive linear circuit elements (L). These circuit elements can be combined in four different ways to form an electrical circuit: the RC circuit, the RL circuit, the LC circuit, and the RLC circuit, with the abbreviations indicating which components are used. These circuits exhibit critical types of behaviour that are essential to analogue electronics. They can, in particular, act as passive filters. In practice, however, capacitors (and RC circuits) are usually preferred over inductors because they are easier to manufacture and are generally physically smaller, especially for higher component values.

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A single-pole filter is formed by combining RC and RL circuits. Whether the reactive element (C or L) is in series or parallel with the load determines whether the filter is low-pass or high-pass. RL circuits are frequently used as DC power supplies for RF amplifiers, with the inductor used to pass DC bias current and prevent RF from entering the power supply.

## RL Circuit

RL Circuits (resistor – inductor circuits), also known as RL networks or RL filters, are a type of circuit that is powered by a combination of inductors and resistors. As a result, in an RL circuit, an inductor and a resistor are connected in either parallel or series. They can be powered by a current (parallel) or a voltage (series) source. Furthermore, the basic passive linear circuit elements are the resistor (R), inductor (L), and capacitor (C). They can create an electrical circuit in four ways, including the RC circuit, the LC circuit, and the RLC circuit.

An RL circuit is also known as an electric circuit with resistance and self-inductance. As we already know, induction occurs when an emf source is applied by a continuous change in the magnetic flux. Mutual inductance is an effect of Faraday’s laws of induction, whereas self-inductance is an effect of Faraday’s laws of induction acting on itself. An inductor is a component of a circuit or a device that has self-inductance. However, because a resistor is present in the ideal form of the circuit, an RL circuit will consume energy, similar to an RC or RLC circuit.

When an inductor is connected in series with the circuit’s resistor, we can see changes in the current. An inductor’s role in a circuit is to oppose changes in magnetic flux, i.e. the inductor does not allow for spontaneous changes in current. When we close the circuit’s switch, the value of the current gradually increases to a maximum. When we close the switch and remove the battery, the inductor voltage causes the current to gradually decrease to zero.

## Use of RL Circuit

• In luminescent tube chokes.
• In order to supply DC power to radio-frequency amplifiers, an inductor is used to pass DC bias current while blocking RF from returning back into the power supply.
• A single-pole filter can be built using RL circuits. The low-pass or high-pass filter is determined by whether the reactive element (C or L) is in series or parallel with the load.
• RLC Circuit/Resonant LC Circuit
• System of communication.
• Signal processing

## FAQs

##### Where Can We Apply the RL Circuit?

An RL circuit is made up of a resistor and an inductor connected in series. This circuit is used in the chokes of luminescent tubes. To provide direct current power to radio frequency amplifiers.

##### What are the functions of RC and RL circuits?

Filtering, waveshaping, and timing are all provided by RC and RL circuits. The capacitor is the most commonly used device. Capacitors are smaller and less expensive than inductors, and they do not have strong magnetic fields. An RC series circuit consists of a voltage source connected in series with a resistor and a capacitor.

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