What is ampere hour (Ah or amp hour)? - Definition from WhatIs.com


ampere hour (Ah or amp hour)

Part of the Smart grid glossary:

An ampere hour (abbreviated Ah, or sometimes amp hour) is the amount of energy charge in a battery that will allow one ampere of current to flow for one hour.

An ampere is a unit of measure of the rate of electron flow or current in an electrical conductor. One ampere of current represents one coulomb of electrical charge moving past a specific point in one second.

A milliampere hour (mAh) is 1,000th of an Ah, and is commonly used as a measure of charge in notebook computer batteries. The mAh provides an indication of how long the PC will operate on its battery without having to recharge it.

See a video about calculating ampere hours:

This was last updated in February 2015
Posted by: Margaret Rouse

Related Terms


  • system-on-a-chip (SoC)

    - System-on-a-chip (SoC) technology is the packaging of all the necessary electronic circuits and parts for a "system" (such as a cell phone or digital camera) on a single integrated circuit (IC), ge... (WhatIs.com)

  • smart grid

    - Smart grid is a generic label for the application of computer intelligence and networking abilities to a dumb electricity distribution system. (WhatIs.com)

  • sensor data

    - Sensor data is the output of a device that detects and responds to some type of input from the physical environment. The output may be used to provide information or input to another system or to g... (WhatIs.com)


  • Smart grid

    - Terms related to smart grids, including definitions about utility electricity delivery systems and words and phrases about smart meters and distributing, monitoring and billing electrical power.

  • Internet applications

    - This WhatIs.com glossary contains terms related to Internet applications, including definitions about Software as a Service (SaaS) delivery models and words and phrases about web sites, e-commerce ...

Ask a Question About ampere hour (Ah or amp hour)Powered by ITKnowledgeExchange.com

Get answers from your peers on your most technical challenges

Tech TalkComment



    Contribute to the conversation

    All fields are required. Comments will appear at the bottom of the article.