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joule

A unit of energy in the MKS system. It is equal to 10,000,000 ergs in the CGS system. Surge protectors are often given joule ratings, but this refers only to the amount of energy they can absorb, not what gets through. See CGS system.



CGS system

(Centimeter-Gram-Second system) A metric system of measurement that uses the centimeter, gram and second for length, mass and time. The units of force and work are the "dyne" and "erg." Contrast with MKS system.



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