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Inst Tools > Blog > Electronic Devices & Circuits > Combining Independent Current Sources in Parallel

Combining Independent Current Sources in Parallel

Last updated: October 6, 2016 6:48 am
Editorial Staff
Electronic Devices & Circuits
1 Comment
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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:

Combining 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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1 Comment
  • KK says:
    July 14, 2023 at 9:08 am

    The R equivalent should be 6/11 Ohms, although in the final calculation you have taken it correctly.

    Reply

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