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    Glossary of Terms

    Common electricity terms, explained

    Want to know the meaning of the terms we use? You’ll find explanations right here.

    For terms used in independent system operator rules, or Alberta Reliability Standards, read our Consolidated Authoritative Document Glossary.

    Start typing a term to filter, or browse terms alphabetically.

    • Alternating current (AC)

      A current that flows alternately in one direction and then in the reverse direction. In North America, the standard for alternating current is 60 complete cycles each second. Cycles per second is also referred to as Hertz (Hz).