Half oval window, which is usually small and placed over a doorway to serve a decorative purpose. Some windows may be hinged at either end to permit opening for ventilation.
Circuit
Arrangement of electrical conductors that allow the flow of electrical current. A complete or partial path for the flow of electrical current; any hookup or wiring that is connected into that path, such as radio, television, etc.
Circuit breaker
A device used to interrupt or break an electrical circuit when an overload condition exists; usually installed in the positive circuit; used to protect electrical equipment.
Circuit lag
As time increases from zero at the terminals of an inductor, the voltage comes to a particular value on the sine function curve ahead of the current. The voltage reaches its negative peak exactly 90 degrees before the current reaches its negative peak thus the current lags behind by 90 degrees.
Circuit tester
A small lamp, used to check for live current, which will glow if the current is active in the electrical receptacle into which it is inserted
Circuit vent
Plumbing drainage system vertical vent which is run from the last two traps on a horizontal drain line to the main vent stack of a building drainage system.
Circuit voltage
Voltage in an electrical circuit.
Circular level
With a circular level you can check to make sure your refrigerator, range, stereo, or washer and dryer are sitting on a level surface.
Circular measure
A system of measuring circles in portions, of the entire circle, such as radians, degrees, minutes or seconds.
Circular mils (cm)
Area of an electrical conductor measured in thousandths of an inch.
