Contents
What direction does current flow in a transistor?
Current freely flows from collector to emitter. Cut-off — The transistor acts like an open circuit. No current flows from collector to emitter. Active — The current from collector to emitter is proportional to the current flowing into the base.
Are transistors directional?
Yes current can flow in both directions. An NPN transistor backwards is also an NPN. There will still be a reverse beta, however, the backwards NPN transistor won’t work as well as a correctly oriented one will. It’s not recommended.
Which direction does current flow in a NPN transistor?
In an NPN transistor, the flow of current runs from the collector terminal to the emitter terminal.
How are the currents carried in a transistor?
Transistor Currents. We know that in transistors and diodes, electric current is carried by both free electrons and holes. Free electrons and holes travel in opposite directions. For example, if free electrons flow from left to right then the holes will flow from right to left.
Which is the direction of the emitter current?
The emitter current IE direction which is represented by an arrow shows that the emitter current is flowing outwards the transistor. On the other hand, the base current IB and collector current IC are flowing into the transistor.
Where does the current flow in a PNP transistor?
The various current components in the pnp transistor which flow across the forward biased emitter junction JE and the reverse biased collector junction JC are shown in the below figure.
What makes up the total emitter current IE?
The emitter current IE consists of hole current IpE (majority carriers holes crossing from emitter into base) and electron current InE (majority carriers electrons crossing from base into emitter). Therefore the total emitter current IE is the sum of hole current IpE and electron current InE