Question

In a transistor output characteristics commonly used in common emitter configuration, the base current$I_B$, the collector current $I_C$and the collector-emitter voltage $V_{CE}$ have values of magnitude in the active region:
A) $I_B$and $I_C$both are in $\mu \mathrm{A}$ and $V_{CE}$in volt.
B) $I_B$is in$\mu \mathrm{A}$and $I_C$is in $\mathrm{m}\mathrm{A}$ and $V_{CE}$in volt..
C) $I_B$is in$\mathrm{m}\mathrm{A}$and $I_C$is in $\mu \mathrm{A}$ and $V_{CE}$in $\mathrm{m}\mathrm{V}$.
D) $I_B$is in$\mathrm{m}\mathrm{A}$and $I_C$is in $\mathrm{m}\mathrm{A}$ and $V_{CE}$in $\mathrm{m}\mathrm{V}$.

Answer 1

Hint: Transistor is a current control and voltage source device.

Complete step by step solution:
The Field Effect Transistor is a device controlled by voltage because the drain current depends on the negative voltage applied at the gate. On the other hand, the BJT (Bipolar Junction Transistor) is a current-controlled device, as the current from the collector depends on the base current.

Bipolar junction transistors are "Current Operated Devices" in which a much smaller base current causes a larger Emitter to flow to the Collector current, which is almost equal in itself. The arrow in a transistor symbol stands for conventional current flow.

The base current is very small as compare to the collector current and we get them out in volt. Therefore the $I_B$ is in $\mu \mathrm{A}$ and $I_C$ is in $\mathrm{m}\mathrm{A}$ and $V_{CE}$ in volt. The correct option is B.

Note: Base current is input current which is very small i.e. in the order of $\mu \mathrm{A}$and collector current is much larger then base current i.e. in the order of $\mathrm{m}\mathrm{A}$. And we get the output voltage across the collector emitter-base in volt i.e. in $V_{CE}$.