In electronics, where there is nothing connected to a load and no current can flow. This can be represented by a resistance/impedance that is equal to infinity.
In breathing set design, an open-circuit breathing set is a set (e.g. ordinary sport scuba) where the user breathes from the set and exhales to the surroundings without recycling the exhaled air or gas.
Example Usage of circuit
FTRNews: FTR NEWS: Patrick to Add Nascar circuit to Her Résumé
chrishopgood: RT @autosportnews: Silverstone secures British GP from 2010: #F1 - The British Grand Prix will stay at the Silverstone circuit next ye.. ...
WEEZIE914: The Pittsburgh Sports Radio circuit seems to be sick of Ike Taylor.. 1 just said "I am tired of his mistakes and the whole swaggin thing"lol