Practical Current Source Consists Of

Answer: C. An ideal current source with high impedance in parallel

Practical current source consists of an ideal current source with high impedance in parallel.

Solution

Ideal current source delivers energy at a specified current (i_S) which is independent of the voltage across the source and ideal current source has infinite internal impedance connected in parallel. 

But a practical current source delivers energy at a specified current (i_S) which depends on the voltage across the source. A practical current source consists of an ideal current source in parallel with high impedance.

Independent current source does not obey ohm’s law since V-I characteristics of independent current source are non-linear. But in practice independent current source does not exist.

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