--- description: What is an Ampere Hour (Ah or Amp hour): It is a charge indicator that defines a current of one ampere running for one hour. title: What is an Ampere Hour (Ah or Amp hour)? - Energy Theory image: https://energytheory.com/wp-content/uploads/2023/01/Depositphotos_39276615_XL-scaled.jpg --- [ Close Menu ](#) * [About](https://energytheory.com/about-us/) * [EV](https://energytheory.com/category/electric-vehicles/) * [FAQs](https://energytheory.com/category/faqs/) * [Glossary](https://energytheory.com/category/glossary/) * [Green](https://energytheory.com/category/green/) * [Renewable](https://energytheory.com/category/renewable/) * [Sustainable](https://energytheory.com/category/sustainable/) * [Energy Economy](https://energytheory.com/category/energy-economy/) * [Energy Services](https://energytheory.com/category/energy-services/) * [Solar](https://energytheory.com/category/solar/) * [Sustainable](https://energytheory.com/category/sustainable/) * [News](https://energytheory.com/category/latest-news/) * [Language](#) [ ![Energy Theory](https://energytheory.com/wp-content/uploads/2022/11/2e3rtgthghnm.png) ](https://energytheory.com/ "Energy Theory") ![en](https://cdn.gtranslate.net/flags/svg/en.svg)English [![es](https://cdn.gtranslate.net/flags/svg/es.svg) Spanish](#) [![fr](https://cdn.gtranslate.net/flags/svg/fr.svg) French](#) [![en](https://cdn.gtranslate.net/flags/svg/en.svg) English](#) [![it](https://cdn.gtranslate.net/flags/svg/it.svg) Italian](#) [![zh-CN](https://cdn.gtranslate.net/flags/svg/zh-CN.svg) Chinese (Simplified)](#) [![nl](https://cdn.gtranslate.net/flags/svg/nl.svg) Dutch](#) [![fi](https://cdn.gtranslate.net/flags/svg/fi.svg) Finnish](#) [![de](https://cdn.gtranslate.net/flags/svg/de.svg) German](#) [![hi](https://cdn.gtranslate.net/flags/svg/hi.svg) Hindi](#) [![ja](https://cdn.gtranslate.net/flags/svg/ja.svg) Japanese](#) [![pl](https://cdn.gtranslate.net/flags/svg/pl.svg) Polish](#) [![pt](https://cdn.gtranslate.net/flags/svg/pt.svg) Portuguese](#) [![ru](https://cdn.gtranslate.net/flags/svg/ru.svg) Russian](#) [ ![Energy Theory](https://energytheory.com/wp-content/uploads/2022/11/2e3rtgthghnm.png) ](https://energytheory.com/ "Energy Theory") ![en](https://cdn.gtranslate.net/flags/svg/en.svg)English [![es](https://cdn.gtranslate.net/flags/svg/es.svg) Spanish](#) [![fr](https://cdn.gtranslate.net/flags/svg/fr.svg) French](#) [![en](https://cdn.gtranslate.net/flags/svg/en.svg) English](#) [![it](https://cdn.gtranslate.net/flags/svg/it.svg) Italian](#) [![zh-CN](https://cdn.gtranslate.net/flags/svg/zh-CN.svg) Chinese (Simplified)](#) [![nl](https://cdn.gtranslate.net/flags/svg/nl.svg) Dutch](#) [![fi](https://cdn.gtranslate.net/flags/svg/fi.svg) Finnish](#) [![de](https://cdn.gtranslate.net/flags/svg/de.svg) German](#) [![hi](https://cdn.gtranslate.net/flags/svg/hi.svg) Hindi](#) [![ja](https://cdn.gtranslate.net/flags/svg/ja.svg) Japanese](#) [![pl](https://cdn.gtranslate.net/flags/svg/pl.svg) Polish](#) [![pt](https://cdn.gtranslate.net/flags/svg/pt.svg) Portuguese](#) [![ru](https://cdn.gtranslate.net/flags/svg/ru.svg) Russian](#) [Glossary](https://energytheory.com/category/glossary/) # What is an Ampere Hour (Ah or Amp hour)? By [Elliot Clark](https://energytheory.com/author/elliot%5Fclark/)November 17, 20233 Mins Read ![JAN 23 What is Solar Gross Metering?](https://energytheory.com/wp-content/uploads/2023/01/Depositphotos_39276615_XL-1536x1024.jpg "What is an Ampere Hour (Ah or Amp hour)?") It is referred to as a **charge indicator** (or current flow over time). 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. So, the quantity of energy in a battery that allows for the passage of 1 ampere of current for one hour is known as amp hours, frequently abbreviated as Ah or amp hours. Another way to put it is that a battery’s amperage capacity is indicated by its rating, which is 1 Ah. A [deep-cycle battery](https://www.power-sonic.com/blog/deep-cycle-battery-everything-you-need-to-know/) or rechargeable battery can be measured in terms of the unit to estimate its capacity. ### **What is an Ampere?** The **rate of electron flow** or current in an electrical conductor is measured in amperes. An electrical charge of one coulomb per second is represented by one ampere of current. The amount of current and the duration needed for a battery to discharge entirely are combined to form an ampere-hour. Consider it in terms of one ampere of current flowing for an hour. 3,600 coulombs of charge are transferred into the system per hour (ampere-seconds). **Must Read:** [What Does C20 Battery Rating Mean?](https://energytheory.com/what-does-c20-battery-rating-mean/) ### **How is Ah Denoted Mathematically?** Ah is denoted mathematically by the following: **Current (I) x Discharge time = Amp hour (Ah) (T)** The following example illustrates how to calculate the ampere hour rating by using a battery that draws 30 amps (A) and is depleted in 30 minutes: Stream or Current = 30 A Discharge period: 30 minutes (0.5 hours) **Ampere-hour (or Ah) = 30 x 0.5, which equals 15 Ah (or ampere-hour).** The battery shows the ampere-hour rating. If the rating isn’t stated, the battery is likely a beginning battery that isn’t intended to deliver consistent power in ampere hours. ### **What is the Use of Ampere Hour?** Ampere hours are typically used to **rate large batteries.** However, the rating is given in milliampere hours for common AA and AAA batteries and other small cells used in gadgets like personal vaporizers and notebook computers (mAh). The rate of electron flow or current in an electrical conductor is measured in [amperes](https://energytheory.com/what-is-an-ampere/). An electrical charge of one coulomb per second is represented by one ampere of current. The amount of current and the duration needed for a battery to discharge entirely are combined to form an ampere hour. Consider it in terms of one ampere of current flowing for an hour. 3,600 coulombs of charge are transferred into the system per hour (ampere-seconds). Share. 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With a background in environmental science, he has a deep understanding of the issues facing our planet and is committed to educating others on how they can make a difference. #### Related Posts [![Post-consumer recycled (PCR) content](https://energytheory.com/wp-content/uploads/2024/04/Post-consumer-recycled-PCR-content.png "What is Post-Consumer Recycled (PCR) Content?")](https://energytheory.com/what-is-post-consumer-recycled-pcr-content/ "What is Post-Consumer Recycled (PCR) Content?") #### [What is Post-Consumer Recycled (PCR) Content?](https://energytheory.com/what-is-post-consumer-recycled-pcr-content/) April 9, 2024 [![Heating Seasonal Performance Factor (HSPF)](https://energytheory.com/wp-content/uploads/2024/02/Heating-Seasonal-Performance-Factor-HSPF.jpg "What is Heating Seasonal Performance Factor (HSPF)?")](https://energytheory.com/what-is-heating-seasonal-performance-factor-hspf/ "What is Heating Seasonal Performance Factor (HSPF)?") #### [What is Heating Seasonal Performance Factor (HSPF)?](https://energytheory.com/what-is-heating-seasonal-performance-factor-hspf/) February 3, 2024 [![What is Annual Fuel Utilization Efficiency (AFUE)](https://energytheory.com/wp-content/uploads/2024/02/What-is-Annual-Fuel-Utilization-Efficiency-AFUE.jpg "What is Annual Fuel Utilization Efficiency (AFUE)?")](https://energytheory.com/what-is-annual-fuel-utilization-efficiency-afue/ "What is Annual Fuel Utilization Efficiency (AFUE)?") #### [What is Annual Fuel Utilization Efficiency (AFUE)?](https://energytheory.com/what-is-annual-fuel-utilization-efficiency-afue/) February 2, 2024 [Add A Comment ](#) Leave A Reply [Cancel Reply](https://energytheory.com/what-is-an-ampere-hour-ah-or-amp-hour/#respond) Save my name, email, and website in this browser for the next time I comment. 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