# What is the use of reactive power in electric circuitry?

'**Reactive Power**', which is expressed in **reactive volt
amperes**, describes the rate at which energy is alternately
stored (in a circuit's electric or magnetic field) and returned to
the a.c. supply when the field collapses. It differs from true
power, expressed in watts, because true power describes the rate at
which energy is permanently lost by heat transfer due to the
resistive component of the circuit.

Reactive power doesn't 'have an use', *per se*, it's merely
a way of quantifying the movement of energy in the reactive
component of an a.c. circuit.

The vector sum of a circuit's reactive power and its true power is called the apparent power of the circuit, expressed in volt amperes.

### How do you find whether its real or reactive power?

Use a wattmeter, as it only reads 'real power' of your load. Use an ammeter and a voltmeter, and the product of the two readings will give you 'apparent power' of your load. Since apparent power is the vector sum of real power and reactive power, use the following equation to find the reactive power of your load: (reactive power)2 = (apparent power)2 - (real power)2

### What is the importance of reactive power flows in a power system?

Reactive power is a strange subject, even for utility reps. There is a brochure available from most power companies explaining reactive power. There are a couple of short explainations I do not like, so I will not repeat them. It helps to have a diagram like they use in the brochure or cut sheet, so this is not a good forum to answer the question thoroghly. This is usually a question brought up by large…

### Why reactive power not useful?

Reactive power is useful, just not useful in doing real work. Another answer It's unfortunate that we use terms, such as 'imaginary power' and 'useful power' to describe reactive power and true power. This is because these terms are not being used in their 'everyday' sense! For example, 'imaginary power' doesn't mean that it exists only in the mind, or that only true power is 'useful'. These terms are used by mathematicians to differentiate between…

### How is KVAr calculation?

There are various ways in which you can determine the reactive power (in reactive volt amperes) of a load. From the practical point of view, you can use a voltmeter and an ammeter and use the product of their readings to determine the apparent power (in volt amperes) of the load, and a wattmeter to determine the true power (in watts) of the load, then find the vectorial difference: (reactive power)2=(apparent power)2-(true power)2

### What is the use of volt ampere reactive?

volt ampere reactive is the unit of reactive power.It is the power which does no useful work but is required to assist in performing work,such as setting up magnetic fields in motors and transformers.It is also called as imaginary power.It occurs in purely reactive circuit i.e. purely inductive or capacitive.The inductance absorbs the reactive power and capacitance injects the reactive power.In inductance,reactive power is utilised to develop the flux while in the capacitance,the reactive power's…

### What is reactive power and where or how it dissipates?

Reactive power is power created by inductive or capacitive elements in AC systems. A long power transmission line is effectively a wire at a voltage some distance away from ground. A simple capacitor is the same thing - a metal plate, with an air gap between the electrodes. Thus an energized power line can be drawn as a big capacitor in parallel with a resistor which is in series with an inductor (the transmission line…