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Ampere-hour Conversion Table
This comprehensive ampere-hour conversion table shows how various units relate to ampere-hours. Use this reference for quick conversions between ampere-hours and other common electric charge units.
| Conversion | To Unit | Multiplier |
|---|---|---|
| Ampere-hours to coulombs | Coulombs | 3600 |
| Ampere-hours to milliampere-hours | Milliampere-hours | 1000 |
| Ampere-hours to faradays | Faradays | 0.03731136 |
| Ampere-hours to elementary charges | Elementary charges | 2.246943×10²² |
| Ampere-hours to statcoulombs | Statcoulombs | 1.0792528×10¹³ |
This ampere-hour conversion reference table provides accurate conversion factors for electric charge units. All values are based on internationally recognized standards for maximum precision in scientific and engineering applications.
What is an Ampere-hour?
The ampere-hour (symbol: Ah) is a unit of electric charge that represents the amount of charge transferred by a steady current of one ampere flowing for one hour. It is commonly used to express the capacity of batteries and other electrical storage devices. One ampere-hour equals 3,600 coulombs (since 1 ampere = 1 coulomb/second and 1 hour = 3,600 seconds).
The ampere-hour is particularly useful for describing the energy capacity of batteries. For example, a 10 Ah battery can theoretically provide 1 ampere of current for 10 hours, or 10 amperes for 1 hour. Our ampere-hour conversion tool helps you easily convert between ampere-hours and other units like coulombs, milliampere-hours, and faradays.
What is the SI of Ampere-hour?
The ampere-hour is not an SI base unit, but it is accepted for use with the International System of Units (SI). The base SI unit for electric charge is the coulomb (C). The relationship between ampere-hour and SI units is:
- 1 ampere-hour (Ah) = 3,600 coulombs (C)
- 1 coulomb (C) = 1 ampere-second (A·s)
This relationship is fundamental for all electric charge conversions between ampere-hours and SI units.
What are Ampere-hours Used For?
Ampere-hours are primarily used to measure the capacity of batteries and other electrical storage devices. As a practical unit for electric charge, ampere-hours provide a standard for all electric charge conversions:
Battery Capacity
Measuring the electrical capacity of batteries in consumer electronics, electric vehicles, and renewable energy systems. For example, a typical smartphone battery might have a capacity of 3,000 mAh (3 Ah), while an electric car battery might have a capacity of 60,000 Ah.
Electroplating
Calculating the amount of material deposited during electroplating processes in manufacturing. For example, determining how much copper will be deposited in an electroplating bath based on the total charge passed through the system.
Electric Vehicle Range
Estimating the range of electric vehicles based on battery capacity and energy consumption. For example, calculating that a 60 Ah battery pack can provide enough energy for a certain driving distance based on the vehicle's efficiency.
Uninterruptible Power Supplies (UPS)
Determining how long a UPS system can provide power during outages. For example, calculating that a 10 Ah UPS battery can power a 5-ampere load for 2 hours.
Etymology and History
The ampere-hour derives its name from the ampere, which is named after André-Marie Ampère, a French physicist who made significant contributions to the study of electromagnetism. The hour component comes from the standard unit of time. The ampere was defined as one of the base units of the SI system in 1948, with the ampere-hour becoming a derived unit for practical applications.
The ampere-hour became widely used with the development of electrical storage technologies, particularly batteries. Its practicality in describing battery capacity made it an essential unit in the electric charge measurement system. The definition has remained consistent even as the definition of the ampere has evolved, most recently in 2019 when it was redefined based on the elementary charge.
Frequently Asked Questions
How do I convert ampere-hours to coulombs?
To convert ampere-hours to coulombs, multiply by 3,600. This is because 1 ampere-hour equals 1 ampere flowing for 3,600 seconds (1 hour), and 1 ampere-second equals 1 coulomb. For example, 2 Ah = 2 × 3,600 = 7,200 coulombs. Our ampere-hour conversion calculator above can perform this conversion instantly.
What's the difference between Ah and mAh?
Ah (ampere-hour) and mAh (milliampere-hour) both measure electric charge capacity. 1 Ah equals 1,000 mAh. Milliampere-hours are commonly used for smaller batteries like those in smartphones and laptops, while ampere-hours are used for larger batteries like those in electric vehicles. For example, a 3,000 mAh phone battery is equivalent to a 3 Ah battery.
How is ampere-hour used in battery specifications?
Battery capacity is often expressed in ampere-hours to indicate how much charge the battery can store. This helps users understand how long a device might operate on a single charge. For instance, a 10 Ah battery can theoretically supply 1 ampere for 10 hours, or 5 amperes for 2 hours. However, actual performance may vary based on discharge rates and other factors.
How do I calculate battery life using ampere-hours?
Battery life in hours can be estimated by dividing the battery capacity (in Ah) by the load current (in A). For example, a 5 Ah battery powering a device that draws 0.5 A would theoretically last 5 ÷ 0.5 = 10 hours. However, real-world factors like temperature, discharge rate, and battery age can affect actual performance.
What are common ampere-hour values for different batteries?
Common ampere-hour values vary widely by application: AA batteries typically have 1.5-3 Ah, laptop batteries 3-8 Ah, car batteries 40-100 Ah, and electric vehicle batteries can range from 20,000 to 100,000 Ah. Our ampere-hour converter tool helps you understand these different scales and convert between units as needed.
How does ampere-hour relate to watt-hours?
Ampere-hours measure charge capacity, while watt-hours measure energy capacity. To convert between them, multiply ampere-hours by voltage to get watt-hours (Wh = Ah × V). For example, a 12V battery with 100 Ah capacity stores 1,200 watt-hours (1.2 kWh) of energy. Our unit converter tools can help you perform these calculations.
Can ampere-hours be used for AC systems?
While ampere-hours are primarily used for DC systems like batteries, they can be applied to AC systems when considering charge transfer over time. However, in AC systems, other units like volt-amperes (VA) or watts (W) are more commonly used for power calculations. For precise electric charge conversions in any system, our ampere-hour calculator provides accurate results.
Is your ampere-hour conversion tool free to use?
Yes, our ampere-hour 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 unit conversion should be accessible to everyone, from students learning about electricity to professionals working on battery systems.