# Difference between Linear & Non-Linear Loads

**URL:** <https://forumautomation.com/t/difference-between-linear-non-linear-loads/13697>\
**Category:** Electrical\
**Tags:** load\
**Created:** [November 7, 2025, 11:19am UTC](https://forumautomation.com/t/difference-between-linear-non-linear-loads/13697 "2025-11-07T11:19:28Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Rabert](https://forumautomation.com/user_avatar/forumautomation.com/rabert/32/6784_2.png) [@Rabert](https://forumautomation.com/u/Rabert)\
**Post date:** [November 7, 2025, 11:19am UTC](https://forumautomation.com/t/difference-between-linear-non-linear-loads/13697/1 "2025-11-07T11:19:28Z")

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## What is Linear Load?

Linear loads in electrical systems are devices (or) equipment that draw current in a sinusoidal way proportional to the applied voltage.

These loads have a linear voltage-current relationship resulting in a stable power factor and minimum waveform distortion.

**Eg:** Linear loads include resistive heaters, incandescent lamps and induction motors that are fully loaded.

## What is Non-Linear Load?

Non-linear loads are electrical devices or equipment that produce non-sinusoidal current waveforms whenever connected to an alternating current power source.

Non-linear loads distort voltage and current waveforms due to internal circuitry, while linear loads pull current in a smooth sinusoidal pattern.

These devices introduce harmonics into the electrical system causing power quality issues like as voltage distortion and increased losses in wires and transformers.

**Eg:** Common examples include computers, LED illumination, variable speed drives, and switching power sources.

## Difference between Linear and Non-Linear Loads

 ![image](https://cdn.forumautomation.com/original/2X/c/c2b1942b29806ad8d23a53946b6b0df028d10a54.jpeg)

## Linear vs Non-Linear Loads

| **Parameter** | **Linear Load** | **Non-Linear Load** |
| --- | --- | --- |
| **Definition** | A load in which the current waveform follows (is proportional to) the applied voltage waveform. | A load in which the current waveform does not follow the voltage waveform; current is distorted. |
| **Waveform Shape** | Pure sine wave (same shape as supply voltage). | Distorted, non-sinusoidal waveform (contains harmonics). |
| **Current–Voltage Relationship** | Linear load follows Ohm’s Law (V = IR) at all times. | Non-linear load does not follow Ohm’s Law due to varying impedance. |
| **Harmonic Generation** | No harmonics generated. | Produces harmonics that can distort the power system. |
| **Power Factor** | Near unity (high power factor). | Poor or distorted power factor due to harmonics. |
| **Examples** | Incandescent lamps, resistive heaters, electric iron, simple motors, fans. | Computers, LED drivers, UPS, variable frequency drives (VFDs), SMPS, fluorescent lights. |
| **Effect on System** | Stable voltage and current, no waveform distortion. | Causes voltage distortion, overheating in cables/transformers, and reduced equipment life. |
| **Measurement Tools** | Normal voltmeter and ammeter sufficient. | Requires True RMS meters or power analyzers for accurate readings. |

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