ampere-hour: meaning, definition, pronunciation and examples
LowTechnical/Scientific
Quick answer
What does “ampere-hour” mean?
A unit of electric charge equal to the charge transferred by a steady current of one ampere flowing for one hour.
Audio
Pronunciation
Definition
Meaning and Definition
A unit of electric charge equal to the charge transferred by a steady current of one ampere flowing for one hour.
Used to measure battery capacity, indicating how much total charge a battery can deliver over time.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or usage. Spelling is consistent. The unit is used identically in scientific and technical contexts worldwide.
Connotations
Neutral technical term in both varieties.
Frequency
Equally low frequency in both varieties, confined to technical fields.
Grammar
How to Use “ampere-hour” in a Sentence
[Number] + ampere-hour(s)ampere-hour + capacityrated at + [Number] + AhVocabulary
Collocations
Examples
Examples of “ampere-hour” in a Sentence
adjective
British English
- The ampere-hour rating is crucial.
- Check the ampere-hour specification.
American English
- The ampere-hour capacity is listed.
- Look for the ampere-hour value.
Usage
Meaning in Context
Business
Used in specifications for batteries in consumer electronics, electric vehicles, and energy storage systems.
Academic
Standard unit in physics and electrical engineering textbooks and research papers on electrochemistry and energy storage.
Everyday
Rare. Might be encountered when comparing specifications for car batteries, phone power banks, or solar equipment.
Technical
Primary context. Used in datasheets, engineering calculations, and standards (e.g., IEC 62660) to define battery performance.
Vocabulary
Synonyms of “ampere-hour”
Strong
Neutral
Weak
Vocabulary
Antonyms of “ampere-hour”
Watch out
Common Mistakes When Using “ampere-hour”
- Pronouncing it as 'ampere-per-hour' (it's not a rate).
- Confusing it with 'amp-hour' in informal writing – the standard unit is 'ampere-hour'.
- Using it as a measure of power (it's a measure of charge).
FAQ
Frequently Asked Questions
Yes, 'amp-hour' is a common informal abbreviation for 'ampere-hour'. In formal technical writing, 'ampere-hour' (Ah) is preferred.
Multiply the ampere-hour (Ah) value by the battery's voltage (V). Watt-hours (Wh) = Ampere-hours (Ah) × Volts (V). This converts charge to energy.
Yes, it is a standard unit for expressing the charge capacity of any electrochemical battery, from small button cells to large industrial battery banks.
It directly indicates how much charge the vehicle's battery pack can store, which is a key factor in determining the potential driving range between charges.
A unit of electric charge equal to the charge transferred by a steady current of one ampere flowing for one hour.
Ampere-hour is usually technical/scientific in register.
Ampere-hour: in British English it is pronounced /ˌæmpeər ˈaʊə/, and in American English it is pronounced /ˌæmpɪr ˈaʊ(ə)r/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “None”
Learning
Memory Aids
Mnemonic
Think of it like a water tank: Amperes are the flow rate (like litres per second), Ampere-hours are the total amount of water in the tank (like litres).
Conceptual Metaphor
ELECTRIC CHARGE IS A FLUID IN A CONTAINER. The ampere-hour measures the 'volume' of electrical 'fluid' a battery can hold.
Practice
Quiz
What does an ampere-hour (Ah) measure?