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A/C Batteries
AVIO 1110 - Power Distribution Systems
| Term | Definition |
|---|---|
| electrolyte | a solution of water and chemical compound that will conduct electric current within a cell |
| electrodes | carbon and zinc elements |
| anode | carbon (the positive electrode of a battery) |
| cathode | zinc plate (the negative electrode of a battery) |
| cell | the combination of two electrodes surrounded by an electrolyte |
| ion | an atom or molecule that is either negatively or positively charged |
| polarization | hydrogen gas bubbles form on the carbon rod and insulate it from solution |
| dry cell | employs a compound of manganese dioxide to prevent accumulation of hydrogen at the positive electrode in a cell |
| primary cell | a cell that cannot be recharged satisfactorily |
| secondary cell | can be recharged |
| alkaline cell | batteries utilizing alkaline electrolyte |
| mercury cell | consists of a positive electrode of mercuric oxide mixed with conductive material and a negative electrode of finely divided zinc |
| sintering | a process of heating finely divided metal particles in a mold to approximately melting temperature |
| OCV | open-circuit voltage - voltage measured when there is no load applied to the battery |
| CCV | closed-circuit voltage - voltage measured while a load is applied to the battery |
| internal resistance | the resistance present inside of a battery while connected to a load |
| storage battery | term that has been used for many years as the name for a battery of secondary cells and particularly for lead-acid and nickel-cadmium batteries |
| lead-acid | secondary cells consist of lead-compound plates immersed in a solution of sulfuric acid and water |
| plate groups | are made by joining a number of similar plated to a common terminal post |
| separators | Their purpose is to keep the plates separated and thus prevent an internal short circuit |
| cell container | when the cell elements are assembled, they are place in _________ |
| absorbed glass mat | battery that has the electrolyte absorbed in several fiber-glass mat separators |
| gel battery | battery that has the electrolyte mixed with silica dust to gorm a immobilized gel |
| hydrometer | tool used to measure specific gravity, or density, of a liquid |
| specific gravity | ration of the weight of a given volume of that substance to the weight of an equal volume of pure water at +4 degrees Celsius |
| battery load tester | will test not only batteries but also the the aircraft's charging system if so desired |
| constant-current charger | supplies a consistent current to a battery for the entire charge cycle |
| constant-voltage charger | supplies a constant voltage to the battery and allows current to change as the battery becomes charged |
| capacity | the measure of a battery's total available current |
| milliampere-hours | small batteries are usually rated in _________ |
| ampere-hours | larger batteries, typical of those found on aircraft, are usually rated in ____________ |
| thermal runaway | a condition where battery chemicals overheat to such a degree the the battery can be destroyed or even explode |
| cell imbalance | reconditioning of the battery is necessary to prevent any ________ |
| deep cycle | to correct a cell imbalance during reconditioning, the battery is typically discharged to zero capacity then recharged. this process is often called a battery __________ |
| electrical leak check | If the battery is received in a charged condition, an _________________ should be performed |
| nickel-cadmium cell | a secondary or primary cell that produces voltage using a nickel compound for the positive electrode and a cadmium compound for the negative electrode |
Created by:
klowdermilk
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