In a p-n-p transistor circuit, the collector current is 10 mA. If 90 % of the holes emitted fro

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In a p-n-p transistor circuit, the collector current is 10...

In a $p-n-p$ transistor circuit, the collector current is $10 \mathrm{~mA}$. If $90 \%$ of the holes emitted from emitter reach the collector; (a) the emitter current will be $9 \mathrm{~mA}$ (b) the emitter current will be $11 \mathrm{~mA}$ (c) the base current will be $1 \mathrm{~mA}$ (d) the base current will be $-1 \mathrm{~mA}$

In a $p-n-p$ transistor circuit, the collector current is $10 \mathrm{~mA}$. If $90 \%$ of the holes emitted from emitter reach the collector;
(a) the emitter current will be $9 \mathrm{~mA}$
(b) the emitter current will be $11 \mathrm{~mA}$
(c) the base current will be $1 \mathrm{~mA}$
(d) the base current will be $-1 \mathrm{~mA}$

Key Concepts

Charge Carrier Injection Efficiency

Charge carrier injection efficiency refers to the percentage of carriers (in a p–n–p transistor, holes) that are injected from the emitter and successfully reach the collector. In this context, if 90% of holes emitted from the emitter reach the collector, then the remaining 10% provide the base current. This concept is crucial because it quantifies the effectiveness of a transistor’s emitter in delivering carriers to the collector, thereby affecting the overall performance and current gains in the device.

Bipolar Junction Transistor (BJT) Operation

The operation of a BJT depends on the efficient transport of charge carriers between the emitter, base, and collector regions. Understanding how the injected carriers from the emitter are divided between the collector and the base is key to the functioning of the transistor. This knowledge not only aids in determining the individual currents (emitter, base, and collector currents) but also in predicting the behavior and performance of the transistor under various operating conditions.

Transistor Current Relationships

In a bipolar junction transistor (BJT), the emitter current is the sum of the collector current and the base current. This relationship is fundamental to understanding BJT operation and is expressed as IE = IC + IB. Analyzing these current relationships helps in determining the losses or recombination of carriers in the base region and understanding the overall current amplification process.

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