"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"
OCTAL NUMBER SYSTEM. A number system based on powers of eight.
OFF-LINE TEST EQUIPMENT. Equipment that tests and isolates faults in modules or assemblies
removed from systems.
OHM. The unit of electrical resistance. That value of electrical resistance through which a constant
potential difference of 1 volt across the resistance will maintain a current flow of 1 ampere through the
resistance.
OHMIC VALUE. Resistance in ohms.
OHMMETER. A meter used to measure resistance. Refer to the Test Equipment Manufacturers page.
OHM'S LAW. The current in an electrical circuit is directly proportional to the electromotive force in the
circuit. The most common form of the law is E = IR, where E is the electromotive force or voltage
across the circuit, I is the current flowing in the circuit, and R is the resistance of the circuit.
OHMS PER SQUARE. The resistance of any square area of thin film resistive material as measured
between two parallel sides.
OILCAN TUBE. A type of planar tube, similar to the lighthouse tube, which has cooling fins. The oilcan
tube is designed to handle large amounts of power at uhf frequencies.
OMNIDIRECTIONAL ANTENNA. An antenna that radiates and receives equally in all directions
(nondirectional). Also see the Antenna definitions page.
Next section of "O" terms
