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Ampere Conversion Table
This comprehensive ampere conversion table shows how various units relate to amperes, the SI base unit for electric current. Use this reference for quick conversions between amperes and other common electric current units.
| Conversion | To Unit | Multiplier |
|---|---|---|
| Amperes to milliamperes | Milliamperes | 1000 |
| Amperes to microamperes | Microamperes | 1000000 |
| Amperes to biots | Biots | 0.1 |
| Amperes to abamperes | Abamperes | 0.1 |
This ampere conversion reference table provides accurate conversion factors for both SI and CGS units. All values are based on internationally recognized standards for maximum precision in scientific and engineering applications.
What is an Ampere?
The ampere (symbol: A) is the base unit of electric current in the International System of Units (SI). It is defined by taking the fixed numerical value of the elementary charge e to be 1.602176634×10⁻¹⁹ when expressed in the unit C (coulomb), which is equal to A⋅s (ampere second), where the second is defined in terms of ΔνCs (the caesium frequency).
The ampere is used worldwide as the standard unit for measuring electric current, forming the foundation for other units of measurement in electrical engineering. Our ampere conversion tool helps you easily convert between amperes and other units. For example, 1 ampere equals 1000 milliamperes or 0.1 biots.
What is the SI of Ampere?
The ampere is one of the seven base units in the International System of Units (SI). It serves as the fundamental unit for measuring electric current. All other electric current units in the metric system are derived from the ampere, making it essential for SI units conversion:
- Milliampere (mA) = 0.001 amperes
- Microampere (µA) = 0.000001 amperes
- Biot (Bi) = 10 amperes
- Abampere = 10 amperes
What are Amperes Used For?
Amperes are used in a wide range of applications across electrical engineering, electronics, physics, and everyday life. As the base SI unit for electric current measurement, amperes provide a standard for all electric current conversions:
Electrical Engineering
Circuit design, power calculations, and electrical system specifications. For example, a typical household circuit breaker might be rated for 15 or 20 amperes.
Electronics
Component specifications, current consumption calculations, and battery capacity ratings. For example, a smartphone charger might provide 1-3 amperes of current.
Physics Research
Experimental measurements, electromagnetic field calculations, and fundamental research. For example, measuring the current in superconducting materials at extremely low temperatures.
Industrial Applications
Motor current ratings, welding equipment specifications, and large-scale electrical systems. For example, an industrial motor might draw hundreds or thousands of amperes.
Etymology and History
The ampere is named after André-Marie Ampère (1775–1836), a French mathematician and physicist who is considered the father of electrodynamics. The unit was officially recognized by the International Electrical Congress in 1881.
The original definition of the ampere, established in 1948, was based on the force between two infinitely long, straight, parallel conductors. The modern definition, adopted in 2019, defines the ampere in terms of the elementary charge, making it one of the most precisely defined units in the SI system. This evolution reflects the advancement of measurement science and the need for more accurate SI units.
Frequently Asked Questions
Why is the ampere the base unit of electric current?
The ampere was chosen as the base SI unit because it represents a fundamental electromagnetic quantity. Its modern definition based on the elementary charge makes it universally reproducible and essential for all electrical measurements. This foundation ensures consistency in scientific research, engineering projects, and international electrical standards.
How accurate is the ampere definition?
The current definition of the ampere is extremely accurate, based on the elementary charge which is a fundamental constant of nature. This definition allows the ampere to be reproduced with an accuracy limited only by our ability to count elementary charges, making it one of the most precisely defined SI units. Such precision is crucial for advanced scientific research and high-tech electronics.
What's the difference between ampere and amp?
There is no difference in meaning. "Ampere" is the full name of the unit, while "amp" is the common abbreviation. Both refer to the same unit of electric current (symbol: A). The choice of term typically depends on context, with "ampere" used in formal scientific writing and "amp" in casual conversation.
How do I convert amperes to other units?
Use our ampere conversion calculators above, or multiply by the appropriate conversion factor. For example, to convert amperes to milliamperes, multiply by 1000; to convert amperes to biots, divide by 10. For detailed instructions on converting amperes to milliamperes, visit our A to mA converter.
What are common uses for ampere conversion?
Ampere conversion is essential in electrical engineering (circuit analysis), electronics (component selection), physics education (student assignments), and home electrical work (breaker panel calculations). Whether calculating the current draw of appliances or converting specifications for international components, our ampere converter tool simplifies these everyday tasks.
How does ampere conversion differ from other electric current units?
As the SI base unit for electric current, the ampere serves as the foundation for all electric current conversions. All other electric current units are defined in relation to the ampere (milliampere = 0.001 amperes, biot = 10 amperes). This relationship makes ampere conversion particularly straightforward compared to converting between unrelated units.
Can I convert very small or very large currents in amperes?
Yes, our ampere converter handles both extremely small and large currents with precision. For microscopic electronics, convert microamperes to amperes (1 µA = 0.000001 A). For industrial applications, convert amperes to kiloamperes (1 kA = 1000 A). Our smart rounding feature ensures readable results for all scales.
Is your ampere conversion tool free to use?
Yes, our ampere 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 concepts to professionals working on complex electrical systems.