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Term Definition
Activation

The process of wetting the cell with electrolyte, followed by the charging or formation process to prepare the cell or battery for use.

Activation Time

The time interval from the moment activation is initiated to the moment the desired operating voltage is obtained in a cell or battery.

Active Material

electrode material which produces electricity during its chemical conversion.

Ampere

Unit of electrical current. (Volts/Watts=Amps or V/W=A)

Ampere Hour (Ah)

The capacity of a storage battery is measured in ampere-hours. One ampere hour is defined as a current flow of one ampere for a period of one hour. Five ampere-hours means a current flow of one ampere for five hours, a current flow of 2 1/2 ampere for 2 hours, or any multiple of current and time that will result in five. This relationship can be expressed as follows: Capacity (In ampere hours)= I*T. Where I is the current (in amperes) and T is the time (in hours). The capacity of a storage battery is usually based on a given discharge rate, since the capacity will vary with the rate of discharge. The capacity of an aircraft battery is usually based on a one hour discharge rate. A 17 ampere hour battery will supply a current of approximately 17 amperes for a period of one hour. A 34 ampere battery will deliver twice that amount of current over the same period of time. If a very heavy load is applied to the battery, it may become discharged in a few minutes.

 

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