Current source = Total current?

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Homework Help Overview

The discussion revolves around understanding the implications of a current source in a circuit schematic, specifically whether the total current can be equated to the value of the current source. Participants explore the conditions under which this assumption may hold true.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants question the validity of assuming that the total current is equal to the current source value without additional context. There are inquiries about how to determine total current in the presence of a current source and other circuit elements.

Discussion Status

The discussion is ongoing, with some participants suggesting that additional information about the circuit is necessary to provide a clearer understanding. There is an exploration of various factors that could influence total current, including the presence of other power sources and circuit components.

Contextual Notes

Participants note that the behavior of components like capacitors and the potential for breakdown voltage are relevant considerations in the analysis of the circuit.

gabjew90
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If a circuit schematic contains a current source, is it safe to assume I(total) is that value?
 
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Just in general. How would I go about finding total current if a current source is present?
 
gabjew90 said:
Just in general. How would I go about finding total current if a current source is present?

It would depend upon what else is in the circuit. For example, if there are other power sources, or active components that can shunt power around from components like capacitors or inductors that can store energy, or switches that can do similar things.

Suppose you had an ideal current supply pushing charge onto a capacitor. The voltage on the capacitor would rise indefinitely! Suppose the capacitor dielectric has a particular breakdown voltage. The voltage on the capacitor would rise until breakdown, then a HUGE avalanche of current would occur across the plates, much larger than the current source.
 

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