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AC Alternating Current
The direction of electrical current reverses, usually many (60) times per second. Electricity transmission networks use AC because voltage can be controlled with relative ease.
AMPERE (amp)
A unit of electrical current or rate of flow of electrons. One volt across one ohm of resistance causes a current flow of one ampere. One ampere is equal to 6.235 x 10 18 electrons per second passing a given point in a circuit.
AMPERE HOUR (amp hr. or AH)
A measure of current over time, used to measure battery capacity.
AMPERE HOUR METER
An instrument that monitors current with time. The indication is the product of current (in amperes) and time (in hours).
ANGLE OF INCIDENCE
The angle between the direct solar beam and the normal (90 degrees) to the active surface. (degrees)
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