An ampere-hour or amp-hour (symbol: A⋅h or A h; often simplified as Ah) is a unit of electric charge, having dimensions of electric current multiplied by time, equal to the charge transferred by a steady current of one ampere flowing for one hour, or 3,600 coulombs.

Ampere hours -- sometimes abbreviated as Ah or amp hours -- is the amount of energy charge in a battery that enables 1 ampere of current to flow for one hour. Another way of saying it is that 1 Ah is the rating indicating how much amperage a battery can provide for one hour.

2025年3月19日 · If you’ve ever noticed ‘Ah’ on a battery, you might wonder what it means and why it matters. ‘Ah’ stands for amp hours, short for ampere hour, which measures how much charge a battery can hold and how long it can power something before needing a recharge. However, Ah isn’t always the best way to compare batteries.

2023年11月17日 · A current of one ampere running for one hour is referred to as an ampere hour or amp-hour or Ah. 3,600 coulombs of charge are exchanged in that hour (ampere-seconds). It is a common way to gauge a battery’s capacity since it measures the amount of current flowing through it in amperes per hour.

2024年5月3日 · Ah, Ampere Hour or Amp Hour all describe the same characteristic of a battery – how long it will last when connected to the item it is powering. This is often referred to as the ‘capacity‘ of a battery.

2024年9月9日 · What is an Amp Hour (Ah)? An amp hour (Ah) is a unit of electric charge that measures the capacity of a battery. Specifically, it indicates the amount of current a battery can deliver over a certain period. One amp hour means that a battery can supply a continuous current of one ampere for one hour.

2017年4月24日 · In the measurement of electricity, amps are a unit of electrical current; amp-hours are units of current storage capacity. For a given voltage, the more power an electrical circuit consumes, the more current flows through it.

2024年5月3日 · Batteries rated with Amperage are stating the highest level of energy they are designed to give at a given moment in time for short periods (such as starting an engine). Batteries rated with Ampere Hour are stating how many amps they can supply over a period of time, the industry standard being 20 hours.

2025年1月16日 · To calculate amp-hours, you need to know the current draw of your device (in amps) and the amount of time you plan to use it (in hours). The formula is: Amp-Hours (Ah) = Current (A) × Time (h)

2015年5月13日 · The ampere-hour (Ah) is a unit of measurement of electrical charge. It represents the amount of charge that passes through the terminals of a battery or electrical conductor when a current of 1 ampere (A) is supplied for 1 hour (h).