For resistors in parallel, the effective resistance will always be less than the lowest individual resistor in the circuit.

To find the effective resistance (Re) use the following formula:

1/Re = 1/R1 + 1/R2 + ...

In your example:

1/Re = 1/12.4 + 1/30

solving for Re = 8.77...

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For resistors in parallel, the effective resistance will always be less than the lowest individual resistor in the circuit.

To find the effective resistance (Re) use the following formula:

1/Re = 1/R1 + 1/R2 + ...

In your example:

1/Re = 1/12.4 + 1/30

solving for Re = 8.77 ohms.

Just remember to take the inverse of your answer on the left to get the value of Re!