Unipolar

Unipolar, also monopolar, stands for:

Occur only charge carriers of one polarity on (for example electrons as mobile charge carriers in metals )
At power sources: a voltage source with two terminals, one of which is connected to ground potential; In contrast, stands at DC bipolar voltage source with three connections (eg with / - 5V to ground) and with alternating anti-phase voltage source with three connections (eg, 2 × 4 kV to earth in transformers of neon lights or microwave ovens ).
In the signal transmission with a ( shielded ) line and ground (shield); In contrast, the balanced signal transmission.

Unlike metals, the current transport in semiconductors is described phenomenologically as if there were there negative (electrons) and positive (holes) charge carriers. Occurs only one of these types of charge carriers as a current feed in an active device on, it is referred to as unipolar (e.g. MOSFET).

The first pacemaker was poured into an insulated synthetic resin and had only one electrode. The sufficiently high pulses were carried out over a single wire from the clock of the pacemaker over the probe to the heart. Due to a number of disadvantages ( pacemaker twitching, susceptibility to interference by external electromagnetic sources) unipolar probes are hardly implanted and have been replaced by bipolar probes. Left ventricular probe of a biventricular pacemaker is unipolar.
Unipolar neuron

Unipolar disorder, unipolar affective disorder (also called " depressive episode ", " dysthymia " ) is a mental disorder