In America, the British thermal unit is sometimes called the heat unit. British thermal unit (Btu) a unit of heat energy defined as the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit. Back to Top - B - Battery An electro-chemical device that stores energy. For examples of this, see the Concorde AGM battery listing. Terms such as "6-hour rate" or "20-hour rate" indicate that the battery is discharged steadily over 6 or 20 hours, and the Amp-hour capacity is measured by how much it puts out before reaching 100% DOD or 1.75 volts per cell. SLI batteries are not rated in AH, but in "CCA", or cold-cranking amps (marine batteries are often rated in "marine cranking amps"). Ampere-hours (AH) designates the storage capacity of the battery. For example, a battery rated at 100 AH at the 6-hour rate would be rated at about 135 AH at the 48-hour rate. Amp-hour ratings will vary with temperature, and with the rate of discharge. Similar to the "gallons per day" measure of water. A current of one amp for one hour would be one amp-hour a current of 3 amps for 5 hours would be 15 AH. Current multiplied by time in hours equals ampere-hours. Ampere-hour or AH The unit of electrical capacity - this tells you how much power the battery will store. One ampere of current results from a potential distribution of one volt per ohm of resistance, or from a power production rate of one watt per volt of potential. For example, one ampere represents a current flow of one coulomb of charge per second. But scientists can use the idealized definition to construct appropriate real-world equipment in their laboratories.) The other electrical units are all defined in terms of the ampere. (You're welcome to object that no one can make an infinitely long conductor, nor a perfect vacuum. One ampere is the current which, if it's flowing in these conductors, creates between them a force of 0.2 micronewtons per meter of length. Place these conductors one meter apart in a perfect vacuum. The official definition of the ampere goes like this: suppose we have two parallel conductors, infinitely long and having a negligible cross-section. The fundamental unit of electric current, named for the French physicist Andr-Marie Ampre (1775-1836), one of the pioneers in studying electricity. One amp for one hour is called an "amp-hour" or AH. One volt placed across a one-ohm resistance will cause a current of one Amp to flow. A - Ampere, or Amp The unit of measurement of current flow. Select the first letter of the word from the list above to jump to appropriate section of the glossary. A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Also, see our glossary of solar terms and usage. Pump Installation Equipment & AccessoriesĪn extensive dictionary of battery terms and usage.Solar Pump Installation Equipment & Accessories.Solar Pump Controllers & Current Boosters.
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