An ampere hour or amp hours (symbol Ah ; also denoted A? H or A h ) is the unit of electrical charge, having the dimension of electric current multiplied by time, equal to the charge transferred by a steady current of one ampere flowing for one hour, or 3600 coulomb. The usual view of milliampere hour (mAh or mA? H) is one thousandth of an ampere (3.6 coulomb).
Video Ampere hour
Use
Ampere clocks are often used in the measurement of electrochemical systems such as electroplating and for battery capacity where commonly known nominal voltages are dropped.
A milliampere second (mA? S) is the unit of measure used in X-ray imaging, diagnostic imaging, and radiation therapy. This quantity is proportional to the total X-ray energy generated by a given X-ray tube operated at a given voltage. The same total dose can be delivered in different time periods depending on the current X-ray tube.
Ampere clock is not an energy unit. In a battery system, for example, an accurate calculation of the delivered energy requires the integration of transmitted power (instantaneous voltage products and instantaneous current) during the release interval. Generally, battery voltage varies during discharge; the average value or nominal value can be used to estimate the integration of power.
Maps Ampere hour
Other size electric charge
The Faraday constant is a charge on one mole of electrons, approximately equal to 26.8 amperes. This is used in electrochemical calculations.
Example
- A AA dry cell has a capacity of about 2 to 3 hours of ampere.
- Automotive car batteries have varying capacities but a large car driven by an internal combustion engine will have a battery capacity of about 50 amperes.
- Since an ampere hour can produce 0.336 grams of aluminum from aqueous aluminum chloride, yielding one tonne of aluminum requires a transfer of at least 2.98 million ampere hours.
See also
- Electrochemical equivalent
References
Source of the article : Wikipedia
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