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glossary |
g-hglos.htm*
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Gassing: The separation of hydrogen and oxygen that occurs as the batter approaches 100% state of charge. It can also happen if the battery is under heavy load. This gas is very explosive when in concentrations of more than 2 parts per million (PPM). The loss of water from the electrolyte solution requires the periodic addition of distilled water to lead acid batteries.
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Gel Cell Battery: A type of deep cycle battery that uses a gelled electrolyte. These batteries are sealed and are virtually maintenance free. Not all sealed batteries are gel cell or deep cycle type.
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Grid: The network of utility power distribution.
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Grid-Tie: An alternative source powered electrical system that is connected to a utility distribution grid.
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Ground Fault Protection (GFP): A circuit protection device that prevents the flow of electrical current to earth if a short circuit is present. Usually required in wet locations, i.e. outdoors, kitchen and bathroom circuits.
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Heater:In an indirectly heated electron tube, the element that
supplies heat to the cathode.
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Henry (H):The basic unit of inductance. One henry is the inductance which induces a cemf of 1 volt when the current is changing at the rate of 1 ampere per second.
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Hole:In a crystal lattice, a point which has been vacated by an electron.
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Hysteresis:The lagging of induced magnetism behind the magnetizing force.
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Hertz (HZ): One cycle per second. The standard for utility AC electricity in the United States is 60 HZ or 60 cycles/second.
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High Battery Protection: A control circuit that disconnects charge current flowing to batteries when voltage reaches a dangerously high threshold. Prevents damage created by excess gassing (or boiling) of electrolyte.
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Hydrometer: A simple device that measures the specific gravity of battery electrolyte. Specific gravity readings express state of charge or discharge of battery.
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Glossary