Combining Independent Current Sources in Parallel

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It is not possible to combine independent current sources in series, since this would violate KCL. However, consider the parallel connection of two ideal current sources shown in (a) below:

Independent Current Sources in Parallel

From KCL we find that i i1 + i2 , and by the definition of an ideal current source, this must always be the current into the arbitrary circuit. Thus, the parallel connection of two ideal current sources is equivalent to a single independent current source given by:

Combining independent current sources in parallel

Clearly, the obvious generalization to N current sources in parallel holds.

Example

Combining the parallel independent current sources example

Combining the parallel independent current sources into a single equivalent source, we obtain the circuit:

Combining the parallel independent current sources example 1

Since the equivalent resistance of the three resistors in parallel is given by:

Combining the parallel independent current sources example 2

we obtain:

Req = 11/6 ohms

Then, from Ohm’s Law:

v =  (6/11) * 11 = 6 V

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