# What is a Non-Linear Device? Example â€“ Advantages

Electronics have an important relationship between current, voltage, and resistance, which is famously called Ohmâ€™s law.

Ohmâ€™s law states that voltage is equal to current multiplied by resistance. Based on that, in an electronic circuit, there are two types of devices used â€“ linear and non-linear.

In this post, we will learn the concept of a non-linear device.

## What is a Non-Linear Device?

As the name implies, a non-linear device is one where the relationship between voltage and current is not linear. In linear devices, the output signal is in line with the input signal.

But, in a non-linear device, the relationship between input power and output power does not plot on a graph as a straight line.

## Example of Linear Device

For understanding this, let us take a simple example of Ohmâ€™s law.

Suppose the resistance of a device is 2 ohms. The voltage applied is 10V. As per the formula, the current drawn will be 5A. Now, consider the resistance to be the same at 2 ohms; the voltage applied is now 20V. So, the current drawn will be 10A.

In any case, you see that the ratio between voltage and current is maintained. This is a linear device, in which its resistance does not vary in spite of any condition, be it temperature or any other external condition (can be current also).

In a linear device, all the basic circuit parametersâ€”such as resistance, inductance, capacitance, waveform, and frequencyâ€”do not change with respect to current and voltage.

## Example of a Non-Linear Device

Let us study the second scenario now. Suppose the resistance of a device is 2 ohms. The voltage applied is 10V. As per the formula, the current drawn will be 5A.

Now, consider the resistance to be increasing with an increase in current or temperature. So, for a voltage applied at 20V, if the resistance increases to 4 ohms, then the current drawn will be 5A.

In any case, you see that the ratio between voltage and current is not maintained. This is a non-linear device, in which its resistance varies in many conditions, be it temperature or any other external condition (can be current also). Due to this, the signal relation is also not in conjunction.

In a non-linear device, any of the basic circuit parametersâ€”such as resistance, inductance, capacitance, waveform, and frequencyâ€”can change with respect to current and voltage.