What I understood from the definition of current sources is that it is a source which supplies a constant current across a load no matter how the other parameters (like resistances for example) in the circuit are changed. Am I right?
If I'm right, what is an example of a current source used in a practical circuit?
Wikipedia gave the example of a Van de Graaff generator as a constant current source. (I didn't read the article, because there was a note that the section appeared to contradict itself. I didn't want to get confused.)
I can think of voltage sources – for example a battery which has a constant potential difference across its ends irrespective of the changes in the circuit it is connected to, but I cannot think of a current source. Any example I can think of involves change in the current when the resistances are changed.