# Difference Between Active and Reactive Power

In physics, power is a very important concept for the students.

Power is the result of the voltage and current. This concept is equally important in all branches of engineering, starting from mechanical to electrical to electronics engineering branches.

## Active vs Reactive Power

The main difference between the active and reactive power is that in the case of active power, the power is used in the circuit and reactive power the power is imaginary and is thought to be used in the circuit for subsidiary purposes. The active power is unidirectional, and on the other hand, the reactive power is bidirectional.

The active power is the power that is used in the circuit. The active power exists in both AC and DC circuits. This power exists when the current is in phase with the voltage.

This power is seen flowing and can be measured, so it is called real power.

The reactive power is the power that travels from the emergence source towards the load and back from the load to the emerging power. The reactive power is the imaginary power in a circuit.

This power is imaginary as it is not known to be flowing. This power flows due to the reactive components in the circuit.

## What is Active Power?

In electrical and electronics the active power is a very important concept for basic knowledge. The active power is the power that is used in the circuit. The active power exists in both AC and DC circuits.

This power exists when the current is in phase with the voltage. This power is seen flowing and can be measured, so it is called real power.

When the term power is used, it is termed for the active power only. The unit of the active power is the same as that of power, which is ‘Watt’.

In the practical field of electrical power work, Kilowatt (kW) and Megawatt (mW) is used. The active power is measured in all circuits to understand the dissipated power from the circuit.

The symbol for the active power used is ‘P’. The formula for active power is P=V I cos ø, ‘ø’ is the angle between the phase between the current and voltage.

The active power is seen when the current is in phase with the voltage that is the ø is 0 degrees or 180 degrees. Active power is used to convert electrical energy into other forms of energy.

For example, electrical energy to luminance like in bulb, or electrical energy to optical, etc. Some devices that work in this principle are a toaster, heater, coffee machine, etc.

## What is Reactive Power?

In the concept of power, reactive power is a power that is invisible but exists with that of real power.

The reactive power is the power that travels from the emergence source towards the load and back from the load to the emerging power.

The reactive power is the imaginary power in a circuit. This power is imaginary as it is not known to be flowing. This power flows due to the reactive components in the circuit.

The reactive power is the resultant power in the case of an AC circuit when the current is out of phase with that of voltage. This is mainly observed when the current is 90 degrees out of phase with the voltage.

This reactive power is bi-directional. That is, it flows from the emerging source towards the load and the load towards the emergence source.

Reactive power is a form of power, but the unit of this power is not expressed in watts. It is mainly expressed in ‘var’ in AC power systems.

The reactive power is expressed as ‘Q’. The formula of the reactive power is Q= V I sin ø. Here ‘ø’ is the phase angle between current and voltage, which is normally 90 degrees.

## Main Differences Between Active and Reactive Power

1. Active power is the power that travels from the source of emergence towards the load in contrast to that the reactive power is the power that travels from the emergence source towards the load and the returns back towards the source. It is the power that travels from the emergence source towards the load and returns back towards the source.
2. Active power is unidirectional that is travels in one direction. On the other hand, the reactive power is bidirectional that is travels in both directions.
3. Active power is used in both AC and DC circuits, whereas reactive power is used only in AC circuits.
4. Active power is used to convert the electrical energy into other forms of energy in comparison to that reactive power does not convert but produces electric flux in the circuit.
5. Active power is used in toasters, heaters, coffee machines, etc. on the other hand, reactive power is used in refrigerators, air condition, etc.

## Conclusion

There are three types of power in AC circuits and well in DC circuits. They are active power, apparent power, and reactive power.

The active power and reactive power are described above. Shortly the apparent power is the resultant power of active and reactive power.

Some of these types of powers can be measured but are not described logically. So the active power is considered as the real power or power.

The symbols, formulas, and the definition of active and reactive power are described to clear the doubt regarding these types of power in the fields of physics and engineering.

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