BJT Circuit Problem Find Vc Quickly

Thread starter theBEAST
Start date Mar 9, 2014
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Bjt Circuit

AI Thread Summary

The discussion focuses on a BJT circuit problem where the voltage Vc is determined to be 3V without showing the calculation steps. The key point raised is the assumption that VE is 7V, leading to an emitter current (IE) of 3mA. It is noted that the collector current (IC) is approximately equal to the base current (IB), allowing the 3mA to flow through the collector resistor to ground. The lack of detailed work in the solution raises questions about the methodology used. Understanding these relationships is crucial for analyzing BJT circuits effectively.

Mar 9, 2014

theBEAST

Homework Statement

Here is the diagram and solution for the problem:

The only problem I have is how the solution was able to find the voltage Vc so fast. They got the answer 3V without showing any work?

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Mar 9, 2014

NascentOxygen

Staff Emeritus

Science Advisor

Homework Helper

Were you told that VE = 7v? That means IE is 3mA. With IC practically equal to IB, that 3mA passes through the collector resistor to ground.

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