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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   entire Web this site hertz A measure of the number of cycles or wavelengths of electrical energy per second; U.S. electricity supply has a standard frequency of 60 hertz. Related category    • UNITS Also on this site: Encyclopedia of Science Transport Concepts & Designs (partner site) BACK TO TOP