It depends on the transistor, you just have to look at the data sheet for the transistor.
Transistor is a three terminal device. Its shape may differ with applications.
uni junction transistor
A silicon transistor is a transistor made of silicon.
Similar to a 2N3906 PNP transistor
no is not !
No......... that is som non sence person who says tip0ff0401 is a transister Thair is no nuber in electranics world.
It depends on the transistor, you just have to look at the data sheet for the transistor.
2n3055 is a metal package (to3) tip3055 plastic package (to220) so metal package more heat capacity
Transistor is a three terminal device. Its shape may differ with applications.
The 7812 is not a transistor. It is an integrated circuit, a voltage regulator designed to regulate an input voltage down to 12 volts output. It typically comes in a TO-220 case, and has three leads, so it sure does look like a transistor though!
A transistor acts like a resistor when Gate is connected to Source.
No. A diode is not like a transistor, and a transistor is not like (two) diode(s). Taken in isolation, the emitter-base and collector-base junctions of a transistor appear to be diodes, but they are coupled together so that the base-emitter current affects the collector-emitter current.
uni junction transistor
It looks like an Italian 'transistor'.
An NPN transistor must be biased with a positive voltage in order to "turn on". A silicon transistor must have at least .07 volts on its base to start current flow from the collector to the emitter of the transistor. Some transistors have different biasing voltages. Like a germanium transistor will "turn on" at .02 volts.
A transistor is not a diode. It is also not a pair of back to back diodes. Two diodes connected back to back will not function like a transistor because their junctions are not in close proximity like they are in a transistor. The only reason for "thinking" that a transistor is "like" a pair of back to back diodes is for purposes of quick go-nogo testing with a multimeter, but that will only assess open, short, and leakage status, as well as polarity, but not any of the more useful things, such as hFe.