create new holes.This movement of e

create new holes.This movement of electrons,from the negative voltage source
hrough the junction and from the positive termina of semiconductor to positive
VoHage source.creates a current fiow.Thus current will fiow in a semiconductor when
the semiconductor is forward biased.
When the polarity of the power source is reversed,the semiconductor is said to
be teverse biased.The holes are moved away from the junction by the negative
Voltage,whereas the electrons are drawwn the junction by the positive voltage.Thus
there is little or no combining of electrons and holes at the junction,and no currem
will flow.
In practical terms,there will always be a few electrons and holes near the
junction,allowing a very small current to pass.This small current is known as leakage
current and is usually in the order of a few microamperes (or possibly pico amperes).
When P-type and N-type regions are formed in same crystal,the semiconductor
isknown as a diode or rectifier.The boundary between the two regions is termed a
iunction.The P-region terminal is called the anode.whereas the N-region terminal is
called the cathode
Usually,when such semiconductors are used with signals,the semiconductors
are called diodes or signal diodes. When the device is used for conversion of
alternating current(AC)to direct current(DC),the semiconductor is called a rectifier
4.1.2 Basic Two-junction or Bipolar Transistor
Like a diode.a transistor can be used to prevent (or limit)the flow of current in
one direction.The prime use for a transistor,however.is to control the amount of
current in a circuit.This is done by adding a second junction to the basic diode.
juction.discussed in the above section.For this reason,such transistors are called
two-junction transistors or possibly,bipolar transistors.The author prefers the fommer
term but recognizes that the latter term is also in common use.
There are two possible arrangements for the two-junction in transistors:NPN
where a positive semiconductor material (holes)is placed between two negativ.
semiconductor materials (electrons),and PNP,where the negative material (electrons

結果 (中文) 3:

创建新的洞，这个电子的运动，从负电压源通过结和半导体的积极终端正电压source.creates电流流动。因此，电流将流在半导体的时候半导体正向偏置。当电源的极性反转时，半导体被说成要做反偏见。该洞是由负离结感动电压，而电子drawwn交界的正电压，因此有很少或没有结合电子和空穴的交界处，没有电流将流。在实际的术语中，总是会有一些电子和孔附近的结，允许一个非常小的电流通过，这个小电流被称为泄漏目前，通常是在几毫安秩序（或微微安培）。当p型和n型区域在同一晶体中形成时，半导体被称为二极管或整流。两个地区之间的边界被称为功能。P端称为anode.whereas N端称为阴极通常情况下，当这样的半导体与信号，半导体被称为二极管或信号二极管。当设备用于转换交流电流（交流），以直流（直流），半导体被称为整流器4.1.2基本两结或双极型晶体管就像一个二极管，一个晶体管可以用来阻止（或限制）电流的流动。一个方向。一个晶体管的主要用途，实现控制量在电路中的电流，这是通过添加一个第二个连接到基本二极管。juction.discussed在上面的部分。因此，这种晶体管被称为双结晶体管或者双极晶体管。笔者倾向于前期术语，但承认后一个术语也在共同使用。在晶体管中的两个结的两种可能的安排：NPN其中一个积极的半导体材料（孔）被放置在两个负。半导体材料（电子），和即插即用，其中负极材料（电子