The two main functions of a transistor are: (a) signal amplification, and (b) solid-state switching.
active region
Transistors and/or relays.
If the integrated circuit in some kind of device has 5,000 transistors on it, then before integrated circuits were available, the same function might have been performed by 100 individual transistors. And before transistors were available, the same function might have been performed by 30 vacuum tubes, a fan and air system to keep them cool, and a large power system to operate the tubes and the cooler.
There a two types of bipolar transistors PNP and NPN . This refers to the doping elements used in the silicon components of this 3 layer device with base always in the middle. The arrow is the emitter wire and shows direction of conventional current flow(positive to negative) NPN transistors (generally used in negative earth circuits) have the arrow pointing away from the base connection PNP transistors ( generally used in circuits with positive earth) have the arrow pointing towards the base connection.
in DRAM there will be slightly more than 8 billion transistors (one per bit, plus address decode and support circuits)in SRAM there will be slightly more than 48 billion transistors (six per bit, plus address decode and support circuits)
Integrated circuits (in many microprocessor integrated circuits) containing many billions of transistors each.
active region
Tubes, magnetic logic, and transistors.
Actually either can be used.
ic's are used in CPU to perform any task. these are the combination of circuits, pathways, transistors etc.
No it alternates the power from the circuit/circuits.
That depends:simple passive circuits have no transistorsvacuum tube circuits have no transistorssolid state circuits can have anywhere from no transistors (just diodes and/or magnetic amplifying transformers) to as many transistors as needed to perform the function
Yes, transistors can be used as amplifiers, but they are not limited to only this use (they are also used in logic circuits, for example).
The first generation used vacuum tubes, the second used transistors, the third used integrated circuits, and the fourth used integrated circuits on a single computer chip.
Transistors and/or relays.
Transistors
Bipolar Transistors and Diode's .