The ability of an inductor to store energy in the form of a magnetic field (and consequently to oppose changes in current) is called inductance. It is measured in the unit of the Henry (H). Inductors used to be commonly known by another term: choke.
Working for CGS means collaborating with a world-class team of experts and some of the most dynamic organizations around the globe. At CGS, our trademark is our entrepreneurial spirit. Founded in 1984 in New York City with a team of 5 people, CGS has steadily grown to now employ over 7500 professionals across North America, Latin America, Europe and Asia.
Professional Coin Grading Service. Professional Coin Grading Service (PCGS) is a coin grading, authentication, attribution, and encapsulation service founded in 1985. The intent of its seven founding dealers, including the firm's president David Hall, was to standardize grading. The firm has divisions in Europe and Asia, and is owned by parent company Collectors Universe.