What are joules?

Among the factors to consider when choosing a surge protector – how many outlets, the optimal cord length and options such as protection for a coaxial cable connection – perhaps the most important factor is the surge protector's joule rating. read more

The Picojoule (pJ) is equal to one trillionth (10 −12) of one joule. Nanojoule The nanojoule (nJ) is equal to one billionth (10 −9) of one joule. 160 nanojoules is about the kinetic energy of a flying mosquito. Microjoule The microjoule (μJ) is equal to one millionth (10 −6) of one joule. read more

The joule (J) is the unit of measure for energy used in the International System of Units (SI), and the one accepted in scientific circles. The unit is used in all equations and calculations involving energy. read more

Named in honour of the English physicist James Prescott Joule, it equals 10 7 ergs, or approximately 0.7377 foot-pounds. In electrical terms, the joule equals one watt-second—i.e., the energy released in one second by a current of one ampere through a resistance of one ohm. read more