![]() Having two turns the value would be four units while three turns would produce nine units although the length of the coil also enters into the equation. If a coil was of one turn its value might be one unit. The value of an inductance varies in proportion to the number of turns squared. ![]() Typical values of units encountered are milli-henries mH, one thousandth of a henry or the micro-henry uH, one millionth of a henry.Ī small straight piece of wire exhibits inductance (probably a fraction of a uH) although not of any major significance until we reach UHF frequencies. The standard value of inductance is the Henry, a large value which like the Farad for capacitance is rarely encountered in electronics today. We said a piece of wire wound into a coil form has the ability to produce a counter emf (opposing current flow) and therefore has a value of inductance. ![]() Alternatively it could be said "inductance is the property of a circuit by which energy is stored in the form of an electromagnetic field". ![]() The property of inductance might be described as "when any piece of wire is wound into a coil form it forms an inductance which is the property of opposing any change in current".
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