# What Is Dynamic Resistance?

Are you curious to know what is dynamic resistance? You have come to the right place as I am going to tell you everything about dynamic resistance in a very simple explanation. Without further discussion let’s begin to know what is dynamic resistance?

## What Is Dynamic Resistance?

Dynamic resistance is a term used in electrical engineering to describe the resistance of a circuit that varies with the frequency of the applied voltage or current. In this blog, we will be discussing the concept of dynamic resistance, its formula, and examples of its application in real-world circuits.

## Definition Of Dynamic Resistance:

Dynamic resistance is defined as the resistance of a circuit that varies with the frequency of the applied voltage or current. It is also referred to as AC resistance, as opposed to DC resistance, which remains constant regardless of the frequency of the applied voltage or current.

## The Formula For Dynamic Resistance:

The formula for dynamic resistance can be expressed as:

R = dV/dI

Where R is the dynamic resistance, V is the applied voltage, and I is the current flowing through the circuit. The value of dynamic resistance varies with the frequency of the applied voltage or current.

## Examples Of Dynamic Resistance In Real-World Circuits:

Dynamic resistance is an essential concept in understanding the behavior of various electrical components and circuits. Here are a few examples of its application in real-world circuits:

1. Diode: A diode is a two-terminal device that allows current to flow in only one direction. The dynamic resistance of a diode varies with the forward bias voltage applied to it. As the voltage increases, the dynamic resistance decreases.
2. Capacitor: A capacitor is a passive component that stores electrical energy in an electric field. The dynamic resistance of a capacitor varies with the frequency of the applied voltage. At higher frequencies, the dynamic resistance of a capacitor decreases.
3. Inductor: An inductor is a passive component that stores electrical energy in a magnetic field. The dynamic resistance of an inductor varies with the frequency of the applied current. At higher frequencies, the dynamic resistance of an inductor increases.

## Conclusion:

Dynamic resistance is an essential concept in understanding the behavior of various electrical components and circuits. It describes the resistance of a circuit that varies with the frequency of the applied voltage or current. By understanding the concept of dynamic resistance and its formula, electrical engineers can design and analyze circuits more effectively.

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## FAQ

### What Are Dynamic And Static Resistance?

The diode offers a static resistance when connected in forward and reverse bias with a DC supply, and the resistance offered with an AC supply is called dynamic resistance.

### What Is The Dynamic Resistance Of The Diode?

A dynamic diode resistance is defined in terms of the voltage-current ratio, i.e., the ratio of a small change in voltage to a small change in current, where a changing voltage equals a changing current. It is correlated with the temperature by Einstein’s thermal voltage Vt=kT/q.

### What Is The Dynamic Resistance Of Diode Class 12?

The dynamic resistance can be defined from the I-V characteristic of a diode in forward bias. It is defined as the ratio of a small change in voltage to a small change in current, i.e. ∴ The dynamic resistance of the diode is directly proportional to the temperature.

### What Is Meant By The Dynamic Resistance Of Pn Junction Diode?

In a junction diode, applied voltage (V) is not proportional to the diode current and hence it does obey Ohm’s law. So junction diode is an example of a non-ohmic conductor. The resistance of a is the function of the operating current.

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