A femtowatt is an SI derived unit of power equal to 10⁻¹⁵ watts, used for expressing extremely small power rates.

How does joule per second relate to watt?

One joule per second (J/s) is exactly equal to one watt (W), representing the rate of energy transfer.

In which fields is converting femtowatts to joule per second useful?

This conversion is useful in radio astronomy, photodetection, nanoscale electronics, and ultra-sensitive sensor measurements.

How to Convert from Femtowatt [fW] to Joule/second [J/s]?

Learn how to convert power values from femtowatts (fW) to joules per second (J/s) using our easy-to-use online converter. Understand the significance of these units and how to apply this conversion in scientific and engineering contexts.

Femtowatt [fW]

Joule/second [J/s]

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Femtowatt [fW] to Joule/second [J/s] Conversion Table

Femtowatt [fW]	Joule/second [J/s]

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.

Femtowatt [fW] to Joule/second [J/s] Conversion Table
Femtowatt [fW]	Joule/second [J/s]

Explore More Power Units Converter

What Is This Tool?

This converter allows you to transform power measurements from femtowatts (fW), which denote extremely small power levels, into joules per second (J/s), the standard SI unit for power equivalent to watts.

How to Use This Tool?

Enter the power value in femtowatts (fW) into the input field.
Select femtowatt as the from-unit and joule per second as the to-unit.
Click the convert button to view the power expressed in joules per second (J/s).

Key Features

Converts power values from femtowatts (fW) to joules per second (J/s) with a straightforward interface.
Supports understanding of extremely low-level power measurements used in sensitive scientific fields.
Browser-based tool requiring no installation for quick and easy access.

Examples

5 femtowatts [fW] converts to 5 × 10⁻¹⁵ joules per second [J/s].
100 femtowatts [fW] converts to 1 × 10⁻¹³ joules per second [J/s].

Common Use Cases

Expressing very low-level signals in radio astronomy and microwave sensing.
Measuring output or background power in ultra-sensitive photodetectors and single-photon counters.
Analyzing power dissipation in cryogenic, nanoscale, and ultra-low-power electronic devices.

Tips & Best Practices

Ensure measurements are taken with instruments sensitive enough to detect femtowatt-level power.
Use the accurate units while converting to maintain consistency across scientific calculations.
Understand the context of measurement to interpret extremely low power values correctly.

Limitations

Femtowatt-level power values are extremely small and can be influenced by noise and instrumental precision.
Conversion accuracy depends on the sensitivity and reliability of the measurement equipment.
Not suitable for representing power values outside the ultra-low power range.

Frequently Asked Questions

What is a femtowatt?: A femtowatt is an SI derived unit of power equal to 10⁻¹⁵ watts, used for expressing extremely small power rates.
How does joule per second relate to watt?: One joule per second (J/s) is exactly equal to one watt (W), representing the rate of energy transfer.
In which fields is converting femtowatts to joule per second useful?: This conversion is useful in radio astronomy, photodetection, nanoscale electronics, and ultra-sensitive sensor measurements.

Key Terminology

Femtowatt [fW]: An SI derived unit of power equal to 10⁻¹⁵ watts, used to quantify extremely small rates of energy transfer.
Joule per second [J/s]: The SI derived unit of power equal to one watt, measuring the rate of energy transferred per second.

Quick Knowledge Check

What is the equivalent of 1 femtowatt in joule per second?

1 × 10⁻¹² J/s

1 × 10⁻¹⁵ J/s

1 × 10⁻¹⁸ J/s

Which unit is exactly equal to one joule per second?

Watt (W)

Femtowatt (fW)

Kilowatt (kW)

What type of devices commonly require femtowatt power measurements?

Ultrasensitive photodetectors

Household appliances

Standard light bulbs

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