Bipolar refers to something that has two distinct (often opposite) characteristics and Unipolar has only one of those characteristics. For example all magnets are bipolar because every magnet has both a North and a South pole. All protons are unipolar because every proton has only a positive charge. Some people are said to have bipolar personalities because they have two distinct personalities which are frequently very different from each other.
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SCR is bipolar device since current is due to both electrons as well as holes.
FETs can be called UNIPOLAR devices because the charge carriers that carry the current through the device are all of the same type i.e. either holes or electrons, but not both. This distinguishes FETs from the bipolar devices in which both holes and electrons are responsible for current flow in any one device.
If a monopolar device is used and the patient return pad is incorrectly attached to the patient then arcing can occur between the pad and the skin which causes burning.
A device which operates(or function) only in one direction is called unidirectional (or unipolar) device
bipolar devices use both majority and minority current carriersunipolar devices use only majority current carriers
diode is unipolar
The FET is a semiconductor device with the output current controlled by an electric field. Since the current is carried predominantly by one type of carriers, the FET is known as a unipolar transistor.
Unipolar NRZ (Non-Return-to-Zero) uses continuous voltage for the entire bit duration, while Unipolar RZ (Return-to-Zero) resets the voltage to zero halfway through the bit duration. This means that Unipolar RZ has more frequent voltage transitions compared to Unipolar NRZ in the time domain.
Uni- one. unipolar depression - this is form of depression without maniacal episode