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Henry Conversion Table
This comprehensive henry conversion table shows how various units relate to henry, the SI derived unit for inductance. Use this reference for quick conversions between henry and other common inductance units.
| Conversion | To Unit | Multiplier |
|---|---|---|
| Henry to millihenry | Millihenry | 1000 |
| Henry to microhenry | Microhenry | 1000000 |
This henry conversion reference table provides accurate conversion factors for both metric (SI) units. All values are based on internationally recognized standards for maximum precision in scientific and engineering applications.
What is a Henry?
The henry (symbol: H) is the SI derived unit of electrical inductance. It is named after Joseph Henry, an American scientist who discovered electromagnetic induction independently of and around the same time as Michael Faraday in England. One henry is defined as the inductance of a closed loop that produces an electromotive force of one volt when the current in the loop changes at a rate of one ampere per second.
The henry is used in electrical engineering to measure inductance, which is the property of an electrical conductor or circuit that opposes a change in current flow. Our henry conversion tool helps you easily convert between henry and other units. For example, 1 henry equals 1000 millihenry or 1,000,000 microhenry.
What is the SI of Henry?
The henry is the SI derived unit for measuring inductance. It is part of the International System of Units (SI) and is expressed in terms of base SI units as kg·m²·s⁻²·A⁻². All other inductance units in the metric system are derived from the henry, making it essential for SI units conversion:
- Millihenry (mH) = 0.001 henry
- Microhenry (µH) = 0.000001 henry
What are Henrys Used For?
Henrys are used in a wide range of applications in electrical engineering and electronics. As the SI derived unit for inductance measurement, henrys provide a standard for all inductance conversions:
Electrical Engineering
Designing inductors, transformers, and other magnetic components in electrical circuits. For example, power transformers might have inductances in the range of several henries.
Electronics
Specifying inductance values for components in electronic circuits. For example, RF circuits commonly use inductors in the microhenry range.
Motor Design
Calculating the inductance of motor windings, which affects motor performance and control characteristics.
Power Systems
Analyzing inductance in transmission lines and power distribution systems, which affects voltage regulation and power quality.
Etymology and History
The unit is named after Joseph Henry (1797-1878), an American scientist who discovered electromagnetic induction independently of and around the same time as Michael Faraday in England. Henry's work was crucial in the development of electromagnetism, and his unit of inductance was officially adopted as part of the SI system in recognition of his contributions to physics.
The henry was formally defined when the SI system was established, relating it to the fundamental units of mass, length, time, and electric current. This definition makes the henry one of the precisely defined units in the SI system, essential for accurate electrical measurements and calculations.
Frequently Asked Questions
Why is the henry the unit of inductance?
The henry was named after Joseph Henry, who made significant contributions to the study of electromagnetism. It was chosen as the SI unit for inductance because it represents a convenient scale for practical measurements and can be precisely defined using fundamental physical relationships. This standardization ensures consistency in electrical engineering calculations and component specifications.
How accurate is the henry definition?
The current definition of the henry is extremely accurate, based on fundamental physical constants and relationships. It is expressed in terms of the base SI units (kilogram, meter, second, and ampere) which are precisely defined. This makes the henry reproducible with high accuracy, crucial for advanced electrical engineering applications and scientific research.
What's the difference between henry and other inductance units?
The henry is the base SI unit for inductance, while millihenry and microhenry are fractional units. One henry equals 1000 millihenry or 1,000,000 microhenry. The choice of unit depends on the magnitude of inductance being measured - henry for large values (like transformer inductances) and millihenry/microhenry for smaller values (like electronic components).
How do I convert henry to other units?
Use our henry conversion calculators above, or multiply by the appropriate conversion factor. For example, to convert henry to millihenry, multiply by 1000; to convert henry to microhenry, multiply by 1,000,000. For detailed instructions on converting henry to millihenry, visit our H to mH converter.
What are common uses for henry conversion?
Henry conversion is essential in electrical engineering for designing circuits, specifying component values, and analyzing electrical systems. Whether calculating inductance for a power transformer or selecting inductors for an RF circuit, our henry converter tool simplifies these tasks for engineers and technicians.
How does henry conversion differ from other electrical units?
As the SI derived unit for inductance, the henry has a specific relationship with other electrical units through fundamental physical laws. For example, inductance relates to voltage and current change rate (V = L * di/dt). This relationship makes henry conversion particularly important in time-varying electrical systems compared to static measurements like resistance.
Can I convert very small or very large inductance measurements in henry?
Yes, our henry converter handles both extremely small and large measurements with precision. For small values, convert microhenry to henry (1 µH = 0.000001 H). For large values, convert henry to kilohenry (1 kH = 1000 H) if needed. Our smart rounding feature ensures readable results for all scales.
Is your henry conversion tool free to use?
Yes, our henry conversion calculator is completely free with no registration required. Simply enter your value, select your target unit, and get instant, accurate results. We believe precise measurement conversion should be accessible to everyone, from students learning electrical engineering to professionals working on complex circuit designs.