Index of Electronics Articles - O

O

Off-hook – Off-line – Ohm – Ohmmeter – Ohm's law – Oliver Heaviside – Omnidirectional antenna – One-way trunk – On-hook – On-line – Open circuit – Open spectrum – Operational amplifier – Optical density – Optical fiber – Optical path length – Optical spectrum – Optoelectronic – Orthogonal frequency division modulation – Orthomode transducer – Oscilloscope – Out-of-band signaling – Output – Outside plant – Overflow – Overhead information – Overmodulation – Override – Overshoot (signal)