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A practical voltage source consists of an ideal voltage source in

A practical voltage source consists of an ideal voltage source in Correct Answer Series with internal resistance

Ideal Voltage Source: An ideal voltage source has zero internal resistance.

Practical Voltage Source: A practical voltage source consists of an ideal voltage source (VS) in series with internal resistance (RS).

An ideal voltage source and a practical voltage source can be represented as shown in the figure.

[ alt="RRB JE EE D1" src="//storage.googleapis.com/tb-img/production/19/03/RRB%20JE%20EE_D1.PNG">

Ideal Current Source: An ideal voltage source has infinite resistance. Infinite resistance is equivalent to zero conductance. So, an ideal current source has zero conductance.

Practical Current Source: A practical current source is equivalent to an ideal current source in parallel with high resistance or low conductance.

Ideal and practical current sources are represented as shown in the below figure.

[ alt="RRB JE EE D2" src="//storage.googleapis.com/tb-img/production/19/03/RRB%20JE%20EE_D2.PNG" style="width: 352px; height: 177px;">

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