Unipolar may refer to:

Electronics

Unipolar generator A homopolar generator is a DC electrical generator comprising an electrically conductive disc or cylinder rotating in a plane perpendicular to a uniform static magnetic field. A potential difference is created between the center of the disc and ...

, a DC electrical generator *

Unipolar motor A unipolar motor (also called homopolar motor) is a direct current (DC) motor typically with slip-rings on each end of a cylindrical rotor and field magnets or a DC field winding generating a magnetic field on the stator. The rotor has typically n ...

, a type of small DC electric motor *

Unipolar transistor The field-effect transistor (FET) is a type of transistor that uses an electric field to control the current through a semiconductor. It comes in two types: junction FET (JFET) and metal-oxide-semiconductor FET (MOSFET). FETs have three termin ...

, transistors that involve single-carrier-type operation

Science and medicine

Unipolar depression Major depressive disorder (MDD), also known as clinical depression, is a mental disorder characterized by at least two weeks of pervasive depression (mood), low mood, low self-esteem, and anhedonia, loss of interest or pleasure in normally ...

or major depressive disorder *

Unipolar mania Unipolar mania is a form of bipolar disorder whereby individuals only experience manic episodes without depression. Depression is often characterised by a persistent low mood, decreased energy and thoughts of suicide. What is seen as its counterpar ...

, an uncommon mental disorder that causes manic episodes without any history of depression *

Unipolar neuron A unipolar neuron is a neuron in which only one process, called a neurite, extends from the cell body. The neurite then branches to form dendritic and axonal processes. Most neurons in the central nervous systems of invertebrates, including inse ...

, a neuron with a single neurite

Other uses

Unipolar encoding Unipolar encoding is a line code. A positive voltage represents a binary 1, and zero volts indicates a binary 0. It is the simplest line code, directly encoding the bitstream, and is analogous to on-off keying in modulation. Its drawbacks are th ...

, a line code *

Unipolarity Polarity in international relations is any of the various ways in which power is distributed within the international system. It describes the nature of the international system at any given period of time. One generally distinguishes three types ...

, a distribution of power in international relations in which one state exercises most of the cultural, economic, and military influence {{disambig