We already have discussed the **Power factor** of an electrical circuit and **how to calculate the power factor**, etc. You might have heard the term **unity power factor** while dealing with the power in electric AC circuits. In this article, we are going to discuss the concept and formula of Unity Power factor of an **electrical circuit**.

**Contents in this article:**

**What is Unity Power factor?****Is Unity power factor possible?****Formula of unity power factor****Physical significance of Unity Power factor**

**Unity Power factor in a circuit**

When the **phase difference** between the **alternating current and voltage** in an AC circuit is zero, then the power delivered in the circuit becomes maximum. At this condition, the power factor of the circuit becomes unity i.e. one (1). This power factor in a circuit is known as **unity power factor**.

**Is Unity power factor possible?**

**Is Unity power factor possible?**

Yes, Unity power factor is possible. When the **circuit is purely resistive**, then the power factor of the circuit becomes unity. Because, the phase difference between alternating current and voltage in a purely resistive circuit is zero.

**Unity power factor formula**

The formula of power factor is {\color{Blue} f=cos\theta}. Where, \theta is the phase angle between the alternating current and voltage. Now, for unity power factor \theta=0. Then the formula of unity power factor is, {\color{Blue} f=cos\theta=1}.

**Physical significance of Unity Power factor**

The power factor of a circuit cannot be unity if the circuit consists of any capacitor or inductor as a **circuit component**. So, the unity power factor of a circuit indicates that the circuit is purely resistive, it do not contain any capacitive or **inductive reactance** at the load. In this case, the apparent power is same as the actual power in the circuit.

This all from this article on **Unity power factor in an electrical circuit**. If you have any doubt on this topic you can ask me in the comment section.

Thank you!

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