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A low-impedance source is called "voltage source". A current source has a very large internal source resistance.ya my question is why we need current source(low impedance source) here.
Yes - correct.Just to clarify. I think Lvw means a constant voltage and constant current source.
I don´t think so. Does a battery deliver a certain current - independent on the connected load? No - it is a voltage source (not ideal, of course, but nothing in electronics is ideal).A battery is a voltage and a current source.
Harald - may I ask you: What is the difference?A battery is a source of current, not a current source - a fine difference.![]()
A battery is a source of current, not a current source - a fine difference.![]()
For my opinion, it is not a "source of current" but a (nearly) constant voltage source. And such a source can, of course, allow a current, which however is determined by the connected load only.
For a currrent source it is vice versa.
To a limited extend, yes.For my opinion, it is just a wording to describe a voltage source having a very large internal resistor (large in comparison to the connected load) - nothing else.
Do you agree?
Yes, of course - mathematically!.To a limited extend, yes.
You can use the same argument and say a voltage source is a current source with a very low internal conductance. Mathematically both are equivalent
I would say that "voltage source" and "current source" refer to the theoretical constructs. A battery approximates a voltage source for some range of loads, and a current source for another set of loads (of course we would rarely employ those sort of loads on a battery -- where the load resistance is small compared to the internal resistance)
"source of current" really says to me not a lot more than there is a potential difference which can withstand some sort of load without falling to zero. It's a very relative term.
I think the fineness of difference is in the wording, not the meaning.
I think you would say "constant current source", where I would simply say current source. This may be getting into pot-a-to/pot-ah-to![]()
Three times: No!Put another way if I said to you connect a resistor to a battery and asked you where was the current coming from.
You would say the battery. And if I said so the battery is providing current then you wold no doubt agree. Then would it be correct to say the battery is the source of this current.
Adam