Relationship between real power and reactive

Difference Between Active and Reactive Power | Difference Between | Active vs Reactive Power

relationship between real power and reactive

The apparent power is the vector sum of real and reactive power. Engineers Understanding the relationship between these three quantities lies at the heart of . In this case, only reactive power flows: There is no net so both active and reactive powers will flow to normal loads. Understanding the relationship among these three. The most significant difference between the active and reactive power is that the below shows the relation between the active, reactive and apparent power.

relationship between real power and reactive

Active power or real power is the amount of power that is actually consumed in an AC circuit. In simple terms, the power that is dissipated is called active power. What is Reactive Power? In case of purely reactive load, voltage is out of phase with the current.

True, Reactive, and Apparent Power | Power Factor | Electronics Textbook

The product of voltage and current is positive for the half of each cycle whereas it is negative for the other half of the cycle meaning the power continuously flows back and forth between the source and load.

This results in reactive power being transferred to the load.


In simple terms, reactive power is the unused power or the imaginary power which is not used for any useful work and it exists when voltage and current are out of phase. Reactive power, on the other hand, is the amount of power that continuously bounces back and forth between the source and load meaning the power which cannot be used for effective work in an AC circuit or system.

It is practically measured in kilowatts KW and megawatts MW in electrical power systems.

relationship between real power and reactive

Reactive power is a form of power but it is not expressed in watts. Instead, it is expressed by the unit volt-ampere reactive var in AC electric power systems.

relationship between real power and reactive

It normally exists when the current waveform and voltage waveform are out of phase, usually by 90 degrees. Active power is the real power dissipated to loads which is later transformed into other forms of energy. Significance Active power is the power manifested in various physical forms such as electromagnetic radiation or mechanical form or acoustic waves, for that matter.

relationship between real power and reactive

Consider the example of a wheel-barrow, a small hand-propelled cart with one wheel and designed to be pushed by a single person. The active power here is the work done on the wheels for carrying stuffs from one place to another, which is the actual work. These units can simplify to Watts, but are left as var to denote that they represent no actual work output. Energy stored in capacitive or inductive elements of the network give rise to reactive power flow.

Difference Between Active & Reactive Power (with Comparison Chart) - Circuit Globe

Reactive power flow strongly influences the voltage levels across the network. Voltage levels and reactive power flow must be carefully controlled to allow a power system to be operated within acceptable limits.

A technique known as reactive compensation is used to reduce apparent power flow to a load by reducing reactive power supplied from transmission lines and providing it locally. For example, to compensate an inductive load, a shunt capacitor is installed close to the load itself.

This allows all reactive power needed by the load to be supplied by the capacitor and not have to be transferred over the transmission lines. This practice saves energy because it reduces the amount of energy that is required to be produced by the utility to do the same amount of work. Additionally, it allows for more efficient transmission line designs using smaller conductors or fewer bundled conductors and optimizing the design of transmission towers.

relationship between real power and reactive

A capacitor is an AC device that stores energy in the form of an electric field. As current is driven through the capacitor, charge build-up causes an opposing voltage to develop across the capacitor. This voltage increases until some maximum dictated by the capacitor structure. In an AC network, the voltage across a capacitor is constantly changing.

Difference Between Active & Reactive Power

The capacitor opposes this change, causing the current to lead the voltage in phase. Capacitors are said to "source" reactive power, and thus to cause a leading power factor.

Induction machines are some of the most common types of loads in the electric power system today.

  • True, Reactive, and Apparent Power
  • Difference Between Active and Reactive Power

These machines use inductorsor large coils of wire to store energy in the form of a magnetic field. When a voltage is initially placed across the coil, the inductor strongly resists this change in current and magnetic field, which causes a time delay for the current to reach its maximum value. This causes the current to lag behind the voltage in phase.