The ratio between the collector current to the base current is called the current gain (β e). The electrons of the emitter (n) repel with the negative poles of the two batteries thus the electrons currents collect at the emitter and move towards the collector, If a small electric signal was added to the base current, its effect appears magnified in the collector current. The emitter (E) is connecting with base (B) in forward connection, The emitter (E) is connecting with the collector (C) such that the emitter is connecting with the negative pole and the collector with the positive pole. The transistor is used when connected in common base circuit to magnify the electric power and it can not be used to magnify the electric current because the collector current is less than the emitter current.Ĭonnecting the transistor in the common emitter circuit (npn) When the current division in transistor = 0.98, It means that the ratio between the collector current (I C) to the emitter current (I E) at constant potential difference between the base and the collector (V CB) = 98 / 100 The value of α e becomes near to I, because the width of the base is very small, has a large amount of impurities and only very small ratio from the current is consumed to fill the holes in the base and the electrons continue its motion to reach the collector, Current division (α e) is the ratio of the collector current to the emitter current at constant potential difference between the base and the collector.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |