What does volt ampere (V*A) represent?

Volt ampere is the unit of apparent power in AC circuits, calculated as the product of RMS voltage and RMS current regardless of phase angle.

When is femtowatt (fW) used?

Femtowatt is used to express extremely small power levels, useful in fields like radio astronomy and ultra-low-power electronic devices.

Can I directly compare volt ampere and femtowatt values?

While you can convert between them, volt ampere measures apparent power which may differ from real power, so conversions assume equivalency for general purposes.

Convert Volt Ampere [V*A] to Femtowatt [fW] Power Units

Easily convert power values from volt ampere (V*A) to femtowatt (fW) using our precise online unit converter. Understand the difference between apparent power and ultra-small power levels.

Volt ampere [V*A]

Femtowatt [fW]

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Volt ampere [V*A] to Femtowatt [fW] Conversion Table

Volt ampere [V*A]	Femtowatt [fW]

Custom Unit Conversion Table Generator – Instant Printable Conversion Tables

Start Value

Enter the starting number (positive decimal or integer ≥ 0). Example: 0.1, 1, 5.

End Value

Enter the ending number (positive decimal or integer > Start Value). Example: 10, 50, 100.

Interval

Enter the step size (positive decimal > 0 and < End Value – Start Value). Example: 1.0, 2.5.

Volt ampere [V*A] to Femtowatt [fW] Conversion Table
Volt ampere [V*A]	Femtowatt [fW]

Explore More Power Units Converter

What Is This Tool?

This tool converts power measurements from volt ampere (V*A), a unit used for apparent power in AC circuits, to femtowatt (fW), an SI unit representing extremely small power quantities. It bridges the gap between large-scale electrical power and very low-level signals.

How to Use This Tool?

Enter the power value in volt ampere (V*A)
Select volt ampere as the input unit and femtowatt as the output unit
Click the convert button to see the equivalent power in femtowatt
Review example calculations to understand the conversion
Apply results to your specific engineering or scientific context

Key Features

Converts apparent power in volt amperes to femtowatt units
Supports a wide range of power scales from large AC systems to nanoscale applications
Easy-to-use interface for quick conversions
Browser-based tool requiring no installation
Provides examples to clarify conversion process

Examples

2 Volt ampere [V*A] converts to 2 × 1,000,000,000,000,000 = 2,000,000,000,000,000 femtowatt [fW]
0.5 Volt ampere [V*A] converts to 0.5 × 1,000,000,000,000,000 = 500,000,000,000,000 femtowatt [fW]

Common Use Cases

Rating and sizing transformers, UPS, and generators based on apparent power
Specifying electrical distribution and protection equipment independent of power factor
Analyzing electrical systems distinguishing between apparent and real power
Measuring very low power signals in radio astronomy and microwave receivers
Assessing power in ultra-low-power nanoscale and cryogenic devices
Calibrating photodetectors and single-photon counters with low-level power measurements

Tips & Best Practices

Verify unit selections before converting to avoid errors from power factor differences
Use examples provided to ensure understanding of large numeric values
Apply the tool when comparing bulk power to nanoscale power dissipation
Manage large magnitude differences carefully to prevent computational mistakes
Understand that volt ampere measures apparent power, not always equal to real power

Limitations

Volt ampere is apparent power and may not equal real power due to power factor variations
Direct conversion assumes apparent power equivalency which might not always be accurate
The very large scale difference can cause misinterpretation if units are not carefully handled
The tool does not account for phase angle or power factor corrections

Frequently Asked Questions

What does volt ampere (V*A) represent?: Volt ampere is the unit of apparent power in AC circuits, calculated as the product of RMS voltage and RMS current regardless of phase angle.
When is femtowatt (fW) used?: Femtowatt is used to express extremely small power levels, useful in fields like radio astronomy and ultra-low-power electronic devices.
Can I directly compare volt ampere and femtowatt values?: While you can convert between them, volt ampere measures apparent power which may differ from real power, so conversions assume equivalency for general purposes.

Key Terminology

Volt Ampere (V*A): A unit of apparent power in AC circuits calculated as root-mean-square voltage multiplied by root-mean-square current.
Femtowatt (fW): An SI power unit equal to 10⁻¹⁵ watt, representing extremely small power levels often used in sensitive measurements.
Apparent Power: The total power in an AC circuit, combining real power and reactive power, measured in volt amperes.
Power Factor: A ratio that represents the phase angle difference between voltage and current, affecting the relationship between apparent and real power.

Quick Knowledge Check

What does the unit volt ampere measure?

Real power in DC circuits

Apparent power in AC circuits

Energy consumption over time

What is a femtowatt primarily used to describe?

High power industrial loads

Extremely low power signals and dissipation

Voltage levels in circuits

Why should you be cautious when converting from volt ampere to femtowatt?

Because volt ampere measures real power only

Because of the difference between apparent power and real power and large scale difference

Because femtowatt is not a power unit

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