Current source = Total current?

AI Thread Summary
In circuits with a current source, the total current (I(total)) cannot be assumed to equal the current source value without considering other circuit elements. Additional components, such as other power sources, capacitors, inductors, or switches, can influence the total current flow. For instance, a current source charging a capacitor can lead to voltage increases that may exceed the current source's output if the capacitor reaches its breakdown voltage. This can result in a significant surge of current that surpasses the initial current source value. Understanding the entire circuit configuration is crucial for accurately determining the total current.
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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