# Difference Between Active Power Reactive Power And Apparent Power Pdf

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*The main difference between active and reactive power is that Active Power is actual or real power which is used in the circuit while Reactive power bounce back and forth between load and source which is theoretically useless.*

- Active, Reactive and Apparent Power
- True, Reactive, and Apparent Power
- Active, Reactive and Apparent Power
- Active Power Reactive Power Apparent Power Pdf

Instantaneous power in an electric circuit is the rate of flow of energy past a given point of the circuit. In alternating current circuits, energy storage elements such as inductors and capacitors may result in periodic reversals of the direction of energy flow. The portion of power that, averaged over a complete cycle of the AC waveform , results in net transfer of energy in one direction is known as active power more commonly called real power to avoid ambiguity especially in discussions of loads with non-sinusoidal currents. The portion of power due to stored energy, which returns to the source in each cycle, is known as instantaneous reactive power , and its amplitude is the absolute value of reactive power.

## Active, Reactive and Apparent Power

The most significant difference between the active and reactive power is that the active power is the actual power which is dissipated in the circuit. The other differences between the active and reactive power are explained below in the comparison chart. The right-angled triangle shown below shows the relation between the active, reactive and apparent power. Measures the power factor of the circuit. The power which is dissipated or do the useful work in the circuit is known as the active power.

It is measured in watts or megawatts. The active power is denoted by the capital alphabet P. The average value of power in the circuit is given by the expression. The reactive power moves between the source and load of the circuit. This power is not doing any useful works on the load. Q represents the reactive power, and it is measured in VAR.

The reactive power is stored in the circuit, and it is discharged by the induction motor , transformer or by solenoids. The active power does the useful work in the circuit. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Skip to content The most significant difference between the active and reactive power is that the active power is the actual power which is dissipated in the circuit.

Key Differences between Active and Reactive Power The active power is the real power consumes by the load. Whereas, the reactive power is the useless power. The active power is the product of the voltage, current and the cosine of the angle between them. Whereas, the reactive power is the product of voltage and current and the sine of the angle between them. The active power is the real power, and it is measured in watts. While the reactive power is measured in VAR.

The letter P represents the Active power, and the Q represents the reactive power. The torque that develops in the motor, the heat dissipated in the heater and the light that emit through the lamps all these produces because of the active power.

The reactive power determines the power factor of the circuit. Leave a Comment Cancel Reply Your email address will not be published. The power which moves back and froth between the load and source such type of power is known as the reactive power.

## True, Reactive, and Apparent Power

It is measured in kilowatt kW or MW. It is the actual outcomes of the electrical system which runs the electric circuits or load. Definition: The power which flows back and forth that means it moves in both the directions in the circuit or reacts upon itself, is called Reactive Power. It has been seen that power is consumed only in resistance. A pure inductor and a pure capacitor do not consume any power since in a half cycle whatever power is received from the source by these components, the same power is returned to the source. This power which returns and flows in both the direction in the circuit, is called Reactive power. This reactive power does not perform any useful work in the circuit.

Active and Reactive Power Introduction to Active and Reactive Power An understanding of the concepts of active and reactive power flow are critical to an understanding of power system dynamics. This chapter first reviews and summarizes the theory related to active and reactive power. Simple equations are then developed for the flow of both active. No reactive power is present; consequently, the angle between active power and complex power will be zero. So in this case, apparent power i. Apparent power can also be described as the amount of power delivered to a system by the source. The reactive power is equivalent to the beer head.

Many practical circuits contain a combination of resistive, inductive and capacitive elements. These elements cause the phase shift between the parameters of electrical supply such as voltage and current. Due to the behavior of voltage and currents, especially when subjected to these components, power quantity comes in different forms. In AC circuits, voltage and current amplitudes will change continuously over a time. Since the power is the voltage times the current, it will be maximized when currents and voltages are lined up with each other. This means that zero and maximum points on current and voltage waveforms occurs at the same time.

## Active, Reactive and Apparent Power

The required power supply is called the apparent power and is a complex value that can be expressed in a Pythagorean triangle relationship as indicated in the figure below. Apparent power is measured in volt-amperes VA - the AC system voltage multiplied with flowing current. Apparent power is a complex value and the vector sum of the active and reactive power as indicated in the figure above. Active - or Real or True - power do the actual work in the load. Active power is measured in watts W and is the power consumed by electrical resistance.

*Explore other articles on this topic. While current and voltage have stable values with direct current, the strength and the direction of both current flow and voltage change regularly in alternating current. In the utility grid, current and voltage have a sinusoidal progression, meaning that their product, electrical power, is also sinusoidal.*

### Active Power Reactive Power Apparent Power Pdf

We know that reactive loads such as inductors and capacitors dissipate zero power, yet the fact that they drop voltage and draw current gives the deceptive impression that they actually do dissipate power. The actual amount of power being used, or dissipated, in a circuit is called true power , and it is measured in watts symbolized by the capital letter P, as always. There are several power equations relating the three types of power to resistance, reactance, and impedance all using scalar quantities :. True power, reactive power, and apparent power for a purely resistive load.

The most significant difference between the active and reactive power is that the active power is the actual power which is dissipated in the circuit. The other differences between the active and reactive power are explained below in the comparison chart. The right-angled triangle shown below shows the relation between the active, reactive and apparent power. Measures the power factor of the circuit. The power which is dissipated or do the useful work in the circuit is known as the active power. It is measured in watts or megawatts. The active power is denoted by the capital alphabet P.

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where. – V = rms voltage [V]. – I = rms current [A]. – φ = phase angle difference between the voltage and current. Active or Real Power φ cos.

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We know that reactive loads such as inductors and capacitors dissipate zero power, yet the fact that they drop voltage and draw current gives the deceptive impression that they actually do dissipate power.