what is difference between voltage source and current source
MIT 6.002 Circuits and Electronics, Spring 2007
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An ideal voltage source has zero internal resistance and a constant emf.
An ideal current source has an infinite internal resistance and delivers a constant current..
In practice a voltage source has a finite internal resistance as does a current source.
A voltage source is assumed to deliver energy with a specific terminal voltage which does not depend upon the current from the source, this is a constant voltage source.
A current source on the other hand is assumed to deliver current with a specified current through the terminals, this is a constant current source.
Well in the batteries the voltage ideally remains constant for a period of time, but the current can be different. To get constant current smart ics are invented.