Question

What is the formula for Reactive power (Pr) in an AC circuit?​

Answer 1

Answer:

We thus define: Apparent power: S = V x I (kVA) Active power: P = V x Ia (kW) Reactive power: Q = V x Ir (kvar)

Explanation:

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Answer 2

Answer:

The formula for reactive power in an AC circuit is Q=VI×sin(Ф).

Explanation:

There are generally three types of powers in an AC circuit:

1. Active Power(P)
2. Reactive Power(Q)
3. Apperant Power(S)

Step 1:

Active power:

• The power which is actually transfered to the load and is dissipated in the circuit is known as Active power.This power is also known as real power,true power,watt-full power,actual power and usefu power.This power is denoted by (P).The unit of active power is Watt(W).

        In AC circuits, P=VI×cos(Ф)

Reactive power:

• Reactive power is that power which remains unused and is produced by the reactive components in an AC circuit.This power is also known as useless power or wattless power.This power is denoted by (Q).Reactive power is given by:

        Q=VI×sin(Ф)

        Reactive power is positive for inductive loads and negative for             capacitive loads.The unit of reactive power is volt-ampere reactive i,e VAR.

Step 2:

Apparent power:

• In AC circuits,the combination of both true power and reactive power is known as apparent power.In simple words, the total power in an AC circuit both dissipated and absorbed is known as apparent power.

It is simply the product of voltage and current without phase angle.The unit of apparent power is volt-ampere(VA).

        $S=VI$