Usually UJT's come in a metal can package. 1) Hold the UJT downwards (seing its terminals). The one in the middle, near the tab, is the emmiter terminal. With this one "north-wise", the left terminal is B2 (west) and the right terminal (east) is B1.
A Unijunction Transistor is a transistor that acts solely as a switch.
JFET is a unijunction transistor.
uni junction transistor
UJT (UniJunction Transistor): It is a transistor with only one junction and three terminals: an emitter (E) and two bases (B1 and B2). BJT (Bipolar Junction Transistor): This type of transistor consists of two junctions and three terminals, namely Emitter "E", Base "B" and Collector"C". There are two types of BJT, i) PNP and ii) NPN.
Intrinsic Stand-off Ratio
See for example http://www.datasheets360.com/pdf/7308997814572458562 In general, terminals are identified by number and name, with reference to the physical appearance of the transistor package.
Emitter, Base, Collector.
Transistor connections are commonly referred to as terminals. For bipolar junction transistors (BJTs), the three terminals are called the emitter, base, and collector. In field-effect transistors (FETs), the terminals are called the source, gate, and drain. These connections are essential for the transistor's operation in amplifying or switching electronic signals.
They use transistor as the purpose to transfer the voltage
It won't work.
UJT(UNIJUNCTION TRANSISTOR) is a three-lead electronic-semiconductor device with only one junction that exclusively as an eletrically controlled swtich andit is not used as a linear amplifier.
It is done in order to protect the transistor from the heavy currents flowing (resistor reduces current flow) into its terminals.