OHM - The unit of measure for electrical resistance, reactance, and impedance. A constant current of one ampere produces a force of one volt. Symbol Ù.
OHM (300) LEAD WIRE - Television lead-in wire. Leads signal in from the antenna to the set.
OHM’S LAW - The electric current,
I, flowing in a conductor or resistor is linearly proportional to the applied difference,
V, across it. From the definition of resistance,
R, Ohm’s law can be written:
V = IR (i.e.,Volts = Current x Resistance.)
OIL FILLED CABLE - Paper insulated, lead sheathed cable, into which high grade mineral oil is forced under pressure, saturating the insulation. The main object is to prevent moisture and gases from entering. It is also easier to detect flaws due to leakage, as the oil is kept under constant pressure at all times.
OIL FILLED PIPE CABLE - Basically the same as oil filled cable, but inside of rigid pipe instead of lead sheath. Sometimes it is a standard oil filled cable inserted into rigid pipe under pressure, both units being oil filled. Usually for much higher voltage where constant pressure is maintained at all times.
OIL RESISTANT - Performance characteristics of a material against exposure to a specific oil.
OKOCORD® - Trade name for portable power cables made by Okonite Company.;
OKOPRENE® - Trade name for Neoprene® covered wire and cable made by Okonite. Neoprene® is a trademark of the DuPont de Nemours Co.
OPEN WIRE - Synonymous with overhead line. A conductor that is not surrounded by insulation and is supported separately above ground.
OPER. - Abbreviation for operating.
OPTICAL RECEIVER - Unit for converting optical signals into electrical signals.
OPTICAL TIME DOMAIN REFLECTOMETER - An instrument that measures transmission characteristics of fiber by sending a pulse of light down the fiber and measuring the light scattered across the length and reflected back from the end as a function of time. Used to measure attenuation, point discontinuities, and fiber length, as well as to find breaks.
