This part has always bothered me.
In order for there to be a current flow,there has to be a potential difference-a voltage.
It is said that the inductor is a current source,and the capacitor a voltage source,when infact,the charged capacitor can deliver far more current at a lower voltage than an inductor,and a charged inductor can produce a far greater voltage than a charged capacitor.
As both are charged,then they become the source.
So why do they say that the inductor is a current source when a capacitor can deliver more current,and a capacitor is a voltage source when an inductor can produce a higher voltage than a capacitor.
Seems all ass about to me.
Brad
Brad: A "current source" means that the source will deliver the same desired current regardless of load impedance. https://en.wikipedia.org/wiki/Current_sourceA ideal current source is a very high voltage( near infinite) source with a very large (near infinite) resistor from that high voltage source to the object of interest. It is able to maintain it's preset current level regardless of load resistance or impedance variations, because compared to the impedance of the supply, which is very high, the load impedance is rather low. Common power supplies do not have near infinite voltage and high value resistors to limit the current and since the headroom on the supply is limited to less than 100 Volts, electronic current limiting is used to simulate the ideal current source, but should the load require higher voltage than is built into the power supply, the current will fall off and not be maintained.. You can test this with your power supply in current limit mode and watch what happens when you exceed the power supply output voltage capability, the current will fall off. A discharging inductor can dump it's current into nearly any load impedance, it doesn't care. If the impedance of the load is very low or very high, it automatically adjusts it's output to maintain current flow. An inductor does not care that a capacitor instantaneously represents a low impedance to the inductor, it will output a steady current into that capacitor to charge it, with near zero loss. I know it's hard to wrap one's head around these concepts and maybe I don't explain it very well or mathematically, but with a few experiments with your existing supply you will get it. When you come to fully grasp the difference, you arrive at a new plateau of being able to understand the nuances of how circuits work. (there are some degreed EE's that don't fully understand it, but it is really very simple) Read some of the stuff on this page for a better explanation. https://www.google.com/search?q=current+source+vs+voltage+source&ie=utf-8&oe=utf-8&client=firefox-b-1Voltage sources are the opposite of current sources, where the impedance of the load against the voltage setting determines how much current flows out of the supply. Regards
« Last Edit: 2019-07-26, 01:56:54 by ion »
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