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Inductance is the
property in an electrical circuit where a change in the current flowing through that circuit induces an
electromotive force (EMF) that opposes the change in current. In electrical circuits, any electric current i
produces a magnetic field and hence generates a total magnetic flux Φ acting on the circuit. This magnetic flux,
due to Lenz's law tends to act to oppose changes in the flux by generating a voltage (a back EMF) that counters or
tends to reduce the rate of change in the current. The ratio of the magnetic flux to the current is called the
self-inductance which is usually simply referred to as the inductance of the circuit.
The term "inductance" was coined by Oliver Heaviside in February 1886. It is customary to use the symbol L for
inductance, possibly in honor of the physicist Heinrich Lenz. In honor of Joseph Henry, the unit of inductance has
been given the name Henry (H).
Standard unit = Henry (H)
1 abH =
1.113 * 10-21
1 H =
1.113 * 10-12
1 µH =
1.113 * 10-18
1 mH =
1.113 * 10-15
1 statH =
8.987 * 1020
8.987 * 1011
8.987 * 1017
8.987 * 1014
Note: The prefix "ab" is used to indicate an electromagnetic unit in the
centimeter-gram-second system. The prefix "stat" is used to indicate an electrical unit in the
electrostatic centimeter-gram-second system of units.