# What is the voltage follower?

A voltage follower (also called unit gain amplifier, buffer amplifier and isolation amplifier) ​​is an op-amp circuit that has a voltage gain of 1. This means that the operational amplifier does not provide any signal amplification. The reason why a voltage follower is called is because the output voltage directly follows the input voltage, ie the output voltage is the same as the input voltage. Thus, for example, if 10V enters the operational input, 10V turns off as an output. A voltage tracking device acts as a buffer without providing amplification or attenuation of the signal.

You can therefore ask, what is the purpose of a follower of tension? Since the same output signal is input, what is its purpose in a circuit? This will be explained now.

An op amp circuit is a circuit with a very high input impedance. This high input impedance is the reason why voltage testers are used. This will be explained now.

When a circuit has a very high input impedance, little current is extracted from the circuit. If you know the law of Ohm, you know the current, I = V / R. So the higher the resistance, the lower the current extracted from an energy source. Therefore, the power of the circuit is not affected when the current is supplied by a high impedance load.

Another reason why voltage users are used because of their importance in voltage division circuits. This again refers to Ohm’s law. According to Ohm’s law, voltage = current x resistance (V = IR).

In a circuit, the voltage is divided or assigned based on the strength or impedance of the components.

Since an operational amplifier has a very high input impedance, most of the voltage will fall on it (because it is such a large impedance). So it is very useful when used in a voltage division circuit because strategically this can allow the designer to provide sufficient voltage to a load.