Convert Apparent Power from Millivolt-Amperes to Gigavolt-Amperes (mVA to GVA)

Millivolt-Ampere to Gigavolt-Ampere Conversion Formula

Example

Let's convert 5 Millivolt-Ampere (mVA) to Gigavolt-Ampere (GVA).

Using the formula:

Therefore, 5 Millivolt-Ampere (mVA) is equal to 5× 10^-12 Gigavolt-Ampere (GVA).

How many millivolt-amperes are in one gigavolt-ampere? One Gigavolt-Ampere (GVA) contains 10¹² Millivolt-Amperes (mVA) — the inverse of the factor above. Multiplying by 10^-12 takes you from millivolt-amperes to gigavolt-amperes; multiplying by 10¹² brings you back.

Put in words: one millivolt-ampere equals 10^-12 gigavolt-amperes, so the millivolt-ampere is the smaller unit of this pair. Converting between them never changes the amount of apparent power being measured — only the size of the unit you count it in.

What is a Millivolt-Ampere (mVA)?

A Millivolt-Ampere (mVA) is a unit of measurement for apparent power, formally recognized by the International System of Units (SI).

It is a tiny unit, equal to exactly one-thousandth of a Volt-Ampere (0.001 VA).

Because this unit is so small, it is not used for common household appliances but is instead used to measure the power in low-energy systems.

You will typically find mVA used in specifications for:

• sensitive electronics
• small transformers
• medical devices
• precision sensors

What Does mVA Measure? (Apparent Power vs. True Power)

The Millivolt-Ampere (mVA) is a unit of apparent power. This is the total power in an AC (alternating current) circuit.

However, it's not the same as the "true power" (measured in Watts) that actually does work, like lighting a bulb.

A simple way to understand this is the "beer analogy":

• True Power (Watts): This is the beer itself—the part you actually want that does the "work."
• Reactive Power (VAR): This is the foam on top. It's not beer, but it's still part of what's in the glass and takes up space.
• Apparent Power (VA or mVA): This is the total of the beer and the foam. It represents the full load the circuit must be able to handle.

Engineers use mVA to precisely measure this total load in very sensitive, low-power circuits.

How to Convert Millivolt-Amperes (mVA) to Volt-Amperes (VA)

The conversion between mVA and its base unit, the Volt-Ampere (VA), is very straightforward. The prefix "milli" means "one-thousandth."

• 1 mVA = 0.001 VA
• 1,000 mVA = 1 VA

This simple 1,000-to-1 ratio makes it easy to scale measurements.

For example, a small electronic component rated at 250 mVA is drawing 0.25 VA of apparent power.

What is a Gigavolt-Ampere (GVA)?

A Gigavolt-Ampere (GVA) is a unit of measurement for apparent power.

As part of the International System of Units (SI), it represents a massive amount of power: one billion volt-amperes (10⁹ VA).

Simply put, GVA is used to describe power on an enormous, national scale.

How is GVA Used? Understanding Scale

GVA is used to measure the vast capacity of national power grids and massive power generation facilities.

For comparison, a typical home might use a few kilovolt-amperes (kVA). In contrast, a single large nuclear power plant can have a capacity rated in GVA.

This measurement represents the total apparent power—a combination of real power (the power that does work) and reactive power (power that sustains magnetic fields).

It is a critical figure for engineers planning and managing the infrastructure that powers entire countries.

What's the Difference Between GVA (Apparent Power) and GW (Real Power)?

It is essential to understand the difference between Gigavolt-Amperes (GVA) and Gigawatts (GW).

• Gigawatts (GW) measure real power. This is the energy that does actual work, like lighting a bulb or turning a motor.
• Gigavolt-Amperes (GVA) measure apparent power. This is the total power in a system, which is a combination of both real and reactive power.

The relationship between these two measurements is defined by the power factor.

In a large-scale grid, a significant difference between the GVA and GW values indicates a high amount of reactive power. While this power doesn't perform useful work, it still strains equipment and can lead to energy loss. This is why managing the total GVA is crucial for maintaining an efficient power grid.

Why GVA Ratings Matter for Heavy Electrical Equipment

Major heavy electrical equipment, such as power transformers and generators, is rated in GVA or the more common Megavolt-Amperes (MVA).

This is because the equipment's physical limits are determined by the total voltage and current it can handle, regardless of the power factor.

The GVA rating tells engineers the absolute maximum apparent power a device can safely manage without overheating or failing.

This makes it a vital safety and design specification for the core components of any high-voltage power grid.

Millivolt-Ampere to Gigavolt-Ampere Conversion Table

Here are some quick reference conversions from Millivolt-Ampere (mVA) to Gigavolt-Ampere (GVA):