Practically, a voltage source is not different from a current source. In fact, a source can either work as a current source or as a voltage source. It merely depends upon its working conditions. If the value of the load impedance is very large compared to the internal impedance of the source, it proves advantageous to treat the source as a voltage source. On the other hand, if the value of the load impedance is very small compared to the internal impedance, it is better to represent the source as a current source. From the circuit point of view, it does not matter at all whether the source is treated as a current source or a voltage source. In fact, it is possible to convert a voltage source into a current source and vice-versa.
Fig.1: A source connected to a load
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