Question

In a bipolar junction transistor:

• A. Collector Current IC = Emitter Current IE = Base Current IB
• B. Emitter Current IE = Collector Current IC – Base Current IB
• C. Base Current IB = Emitter Current IE + Collector Current IC
• D. Base, emitter, and collector currents are equal

Hint:

The relationship between the currents is IE = IB + IC. Note that base current is a control current in the BJT that is used to amplify the output signals.

Answer 1

The Correct Option is B

In a bipolar junction transistor (BJT):
$I_E$ (emitter current) is the total current leaving the emitter.
$I_C$ (collector current) and $I_B$ (base current) are components of $I_E$
According to Kirchhoff's Current Law (KCL): $I_E = I_C + I_B$.
Typically, $I_B$ is much smaller than $I_C$, making $I_E$ approximately equal to $I_C$.