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For resistances in parallel, total effective resistance is [ 1 divided by (1/R1 + 1/R2 + 1/R3 + . . . . . etc.) ]

For two resistors, this expression can be massaged to show that the net effective resistance is

(R1 R2) / (R1 + R2).


(12 x 4) / (12 + 4) = 48/16 = 3 ohms.

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No. Load resistance is the value of the element actually doing the work of the circuit it is connected to. A speaker connected to an amplifier is the load.


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