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Inductor in series
In many occasions it is necessary to obtain the value of a set of inductors that are connected in series or parallel.
The calculation of the equivalent inductor of a set of inductors in series is similar to the calculation of the equivalent resistor of a set of resistors that are in series, then you just need to add their values.
The diagram shows 3 inductors in series and the formula used here is:
LT = L1 + L2 + L3
This formula works fine for the 3 inductors in series of the last diagram, but if we have any number of inductors we can use the following formula:
LT = L1 + L2 + L3 +......+ LN
Where N is the number of inductors in series
Inductor in parallel
The calculation of the equivalent inductor of a set of inductors in parallel is similar to the calculation of the equivalent resistor of a set of resistors that are in parallel.
The diagram shows 3 inductors in parallel and the formula used here is:
1/LT = 1/L1 + 1/L2 + 1/L3
This formula works fine for the 3 inductors in parallel of the last diagram, but if we have any number of inductors, we can use the following formula:
1/LT = 1/L1 + 1/L2 + 1/L3 + .... 1/LN
where N is the number of inductors that are connected in parallel.
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