Inductors Connected in Parallel: What to Expect

Inductors are used in electrical circuits for energy storage and to resist sudden changes in current.

While inductors store energy as magnetic fields, capacitors store electrical charges as electric fields.

The two ways to connect electrical circuit components are either series (components are connected end-to-end) or parallel (components are connected across each other).

What happens when inductors are connected in parallel?

When both terminals of an inductor are connected to another inductor, the configuration is known as “inductors in parallel.”

This parallel setup allows for voltage changes to be the same across all inductors in the series. Connecting inductors in parallel allows them each to share the same magnetic field. The fluctuation in total inductance depends on how much magnetic coupling occurs between the coils.

Do inductors in parallel have the same current?

Inductors connected in parallel do not have the same total current. The sum of each current adds up to the total current. When constant current flows through the inductor, there's no change in the current flowing through the circuit.

Also read: TDK Launches a Thin-Film Inductor That Helps Mobile Design

Does current flow through the inductor?

AC or DC current can flow through an inductor, but not simultaneously. An inductor stores magnetic energy then accesses it when it's needed to balance the current in the circuit. As soon as a switch is turned on, current flows from the top terminal to the bottom terminal of the inductor.

How can you calculate total inductance when inductors are connected in parallel?

The formula for inductors in a parallel circuit is based on Kirchoff's Current Law (KCL), in which L = inductance and LT = total inductance. The total inductance is a parallel circuit can be found by adding up the inductance of each inductor. This equation is expressed as

I/LT = I/L1 + I/L2 + I/L3 and so on + 1/LN

In this equation, the reciprocal (1/L) values of inductances are added rather than simply the inductances. However, this equation can only be used when no mutual inductance or magnetic coupling exists between inductors. It's important to note that coupling between coils can add to the total inductance. When just two inductors are in parallel, here's the simpler formula

LT = (L1 x L2) divided by (L1 + L2)

Also read: Understanding the Differences Between Capacitors and Inductors

How does an inductor behave in a circuit?

When potential changes across an inductor, there is an opposing force that resists change in current. However, when the current remains constant, no change in current means there's no difference across the inductor as if it didn't exist.


Inductors can be connected in parallel to share the same magnetic field. Contact us at Allied Components for more information about inductors and other electric circuit components.

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