ई नेटवर्क व्हिच डज नॉट हैव ऐिदर वोल्टेज सोर्स ऑफ करंट सोर्स इज कॉल्ड
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Answer:
Voltage source:
An ideal voltage source is one that generates a constant voltage irrespective of current delivered by it.
Going by this definition, it is clear that an ideal voltage source cannot have a short circuit. (Why?) because then terminal voltage will fall to zero which is not permitted by definition.
A practical voltage source ( e.g. generator or battery) can be regarded as an ideal voltage source in series with a low resistance, often called internal resistance (or internal impedance in case of an alternator). As the internal resistance is very low as compared to load resistance, power wasted in the source is much less as compared to power received by the load.
Current source:
An ideal current source is one that delivers a constant current irrespective of the voltage across it. Note that in case of a current source, the higher the load resistance, the higher is the voltage drop in resistance (because current is constant), hence the higher is the power output. This is unlike an ideal voltage source where a smaller load resistance means a higher power output.
Again, an ideal current source cannot have open circuit because it defies the definition i.e. current has to remain constant.
A practical current source is made by putting a very large resistance in series with a voltage source i.e. making the internal resistance much higher as compared to load resistance. By doing so, the current remains practically constant irrespective of variations in the load resistance.
Note that practical sources of electricity are generally voltage sources. Certain sources e.g. a charged inductor or secondary current in a current transformer can be regarded as a natural current source.
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