Effect of Copper Coil in Inductor
Inductance is the ratio of the flux of the conductor to the current that produces the flux when AC current passes through the conductor. When the inductor passes through the DC current, there is only a fixed magnetic line around it, which does not change with time. When the copper coil passes through the AC current, there will be a magnetic line around it that changes with time. According to Faraday’s law of electromagnetic induction – magnetoelectricity analysis, the variable magnetic force line will produce induced potential at both ends of the coil, which is equivalent to a “new power supply”. When a closed loop is formed, the induced potential generates an induced current. According to Lenz’s law, the total amount of magnetic lines produced by induced current should be determined to prevent the change of magnetic lines. The change of magnetic force line comes from the change of external alternating power supply. Therefore, from the objective effect, inductance coil has the characteristic of preventing the change of current in alternating current circuit. Inductance coils have similar characteristics to inertia in mechanics. They are electrically named “self-induction”. Sparks usually occur at the moment when the switch is opened or the switch is turned on. This phenomenon of self-induction produces a high induction potential.
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