Recently installed some speakers and noticed they had inductors on them.
In: Engineering
Compare to resistors:
– Resistors take energy out of a circuit in the form of heat. Inductors don’t resist (unchanging) current at all and don’t take energy out of the circuit.
– it takes a voltage to cause a change in current in an inductor. The inductor ‘resists’ changes in current but not the current itself.
– In an AC circuit inductors cause the varying voltage and varying current to be ‘out of phase’. This means their sine waves are shifted in time relative to each other.
Inductors resist changes in current. In an audio circuit, inductors can be used as part of a low pass filter.
As stated, they resist changes in current. They’re basically the complement to capacitors, which resist changes in voltage. The function in circuitry is usually related to current regulation or signal filtering.
The way they do this is by having several loops of wire to create a small electromagnetic field. If you have current running through the wire, then there’s a resulting magnetic field created with a strength proportional to the current.
If you change the current, then you end up changing the strength of the magnetic field. This change then creates an *opposing* current to the wire current. This is what’s called counter-electromotive force, or counter-EMF. Depending on the size of the coil (and also whether a core is used), this can be a small effect (low inductance rating), or it could have a huge effect (very high inductance rating).
Just like capacitors, don’t trust anything with inductors to be discharged after removal of power.
They are in charge of showing all the new electricity that comes through it’s way around. An induction course for their stay before they zippity zap further down the line
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