The calculator below can be used to determine the total equivalent inductance of up to four (4) inductors in series.

Inductors are in series when there is a single current path that travels through each resistor in order.

Inductors are in parallel when there are multiple current paths that may have different values of resistance.

One of the most important quantities is the **equivalent inductance** of the circuit.

Even though inductors may come in complex configurations, we can model the circuit as a single inductor (just as we can model it as a single resistor or capacitor). This inductor will have the value of the equivalent inductor of the whole circuit.

## Formula for Inductors in Series

Inductors in series add their values of resistance simply (like resistors in series), making it easy to calculate their equivalent value. You can think of inductors in series as essentially functioning as a single inductor. Just like resistance, every part of the current path through the circuit adds some amount of inductance, even wire so that the whole circuit can be considered to be a large inductive element.

To find the total inductance in a series circuit (or a single branch of a parallel circuit), you just add up the inductance of everything in the circuit (or branch).

L_{eq} = L_1 +L_2+L_3+...+L_N

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