it is well known that an inductor is a device to resist change in current flow. usually it has low DC resistance but hight AC impedance. it is electrically opposite to the capacitor. it is value is henries ( more commonly millihenries)an inductor is simply a coid of wire with or without a magnetic core. there are two types of inductors, air core and iron core. at a certain frequency, if a coil offers a large opposition to the current, it has large inductance, conversely it has small inductance. resistance offers an opposition to all current flow while inductance only offers an opposition to non-constant current flow.
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