How is a current source made in reality?

Replies

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  sankar3

  yeah, i am also interested to know that...
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  nenuadwani

  i dnt know this perfectly but i think every possible cause of generating elecricity is magnetism. electromagnetism is the main concept.
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  Reya

  An independent current source with zero current is identical to an ideal open circuit. For this reason, the internal resistance of an ideal current source is infinite. The voltage across an ideal current source is determined by the circuit it is connected to. When connected to a short circuit, there is zero voltage and thus zero power delivered. When connected to a load resistance, the voltage across the source approaches infinity as the load resistance is infinity (an open circuit). An ideal current source, if such a thing existed in reality, could supply unlimited power and so would represent an unlimited source of energy.
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  medeepak

  a simple opamp circuit is enough to make a good current source
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  headRush

  High school chemistry in which an electrolytic solution is taken.