Convert Reactive Power from Volt-Amperes Reactive to Millivolt-Amperes Reactive (VAR to mVAR)

Volt-Ampere Reactive to Millivolt-Ampere Reactive Conversion Formula

Example

Let's convert 5 Volt-Ampere Reactive (VAR) to Millivolt-Ampere Reactive (mVAR).

Using the formula:

Therefore, 5 Volt-Ampere Reactive (VAR) is equal to 5000 Millivolt-Ampere Reactive (mVAR).

How many volt-amperes reactive are in one millivolt-ampere reactive? One Millivolt-Ampere Reactive (mVAR) contains 0.001 Volt-Amperes Reactive (VAR) — the inverse of the factor above. Multiplying by 1000 takes you from volt-amperes reactive to millivolt-amperes reactive; multiplying by 0.001 brings you back.

Put in words: one volt-ampere reactive equals 1000 millivolt-amperes reactive, so the volt-ampere reactive is the larger unit of this pair. Converting between them never changes the amount of reactive power being measured — only the size of the unit you count it in.

What is a Volt-Ampere Reactive (VAR)?

A Volt-Ampere Reactive (VAR) is the unit used to measure reactive power in an electrical system.

Think of it as the "helper" power that supports the "real" power (Watts) in doing work.

How VARs Relate to Power Factor Correction

Volt-Ampere Reactive (VAR) is a crucial metric for optimizing a power system's power factor.

A high VAR reading signifies a large amount of reactive power, often leading to an inefficient power factor and higher energy costs.

By implementing power factor correction solutions, such as capacitor banks, businesses can effectively reduce their VAR demand.

This not only improves overall electrical efficiency and lowers utility bills but also frees up system capacity, allowing you to run more equipment without overloading your system.

This makes VAR management essential for any commercial or industrial facility looking to optimize efficiency and reduce costs.

VARs vs. Watts (W) vs. Volt-Amperes (VA): The Power Triangle Explained

In AC power systems, these three units are related and form the "power triangle":

• Watts (W): This is real power, or the "working" power. It's the power that performs the actual work, like lighting a bulb, heating an element, or spinning a motor.
• Volt-Ampere Reactive (VAR): This is reactive power. It doesn't do any useful work itself, but it's essential "support" power required to create magnetic fields for inductive loads like motors, transformers, and ballast.
• Volt-Amperes (VA): This is apparent power, which is the total power supplied by the utility (the combination of both Watts and VARs).

Understanding this relationship is essential for correctly sizing critical electrical infrastructure like generators, transformers, and uninterruptible power supplies (UPS).

The system must be able to supply both the real power (W) and the reactive power (VAR).

The Source and Impact of Reactive Power (VARs)

Reactive power, measured in VARs, is primarily produced by inductive loads connected to an electrical grid.

Common sources include electric motors, transformers, and industrial machinery, all of which require reactive power to establish their magnetic fields. While this power is necessary for the equipment to function, it does not contribute to useful work.

Excessive VARs on the system increase the total current flow. While necessary, too much reactive power is inefficient and can lead to problems like higher energy losses, voltage drops, and potential utility penalties, reducing the overall efficiency of your electrical network.

What is a Millivolt-Ampere Reactive (mVAR)?

A Millivolt-Ampere Reactive (mVAR) is a small unit used to measure reactive power.

Think of reactive power as the "helper" power in an electrical circuit. It doesn't do the actual work (like lighting a bulb), but it's essential for components like motors and transformers to function.

An mVAR is tiny: it's equal to one-thousandth of a single Volt-Ampere Reactive (VAR).

Why Does mVAR Matter for Your Power Factor?

In an AC circuit, you have two types of power. Real power (measured in milliwatts, mW) does the actual work, like spinning a motor. Reactive power (measured in mVAR) is the "non-working" power that builds magnetic and electric fields to help the motor spin.

The problem is that too much reactive power leads to a poor power factor. This is a sign of inefficiency—it means your system is drawing more total power than it's actually using for work.

Managing reactive power, even at the small mVAR scale, is key to improving energy efficiency and keeping voltage levels stable in sensitive electronics.

How mVAR Fits into the Power Triangle

The power triangle is a simple diagram that shows how these three types of power relate. Imagine a right-angle triangle:

• Real Power (mW): The base of the triangle (the "work-doer").
• Reactive Power (mVAR): The vertical side (the "helper").
• Apparent Power (mVA): The longest side, or hypotenuse (the "total power" supplied).

This relationship is shown by the formula (mVA)² = (mW)² + (mVAR)².

For engineers, the goal is to make the reactive power (mVAR) side as small as possible. This makes the total power (mVA) and the real power (mW) almost equal, which means the circuit is very efficient.

Where Is mVAR Used in Practical Applications?

You won't hear about mVAR when discussing a city's power grid (they use much larger units like kVAR or MVAR).

Instead, the Millivolt-Ampere Reactive is crucial for low-power electronics.

Engineers use mVAR measurements in labs when designing or testing individual components like:

• Capacitors
• Inductors
• Integrated circuits

Precise mVAR readings help them understand the "reactive properties" of these tiny parts, ensuring that a final product (like your smartphone or computer) runs as efficiently as possible.

Volt-Ampere Reactive to Millivolt-Ampere Reactive Conversion Table

Here are some quick reference conversions from Volt-Ampere Reactive (VAR) to Millivolt-Ampere Reactive (mVAR):