When the current changes in a circuit
containing inductance, the magnetic linkage changes and
induces a voltage in the inductance:
dy/dt = e
= L di/dt
Note that the induced voltage has a
polarity which opposes the rate of change of current.
Alternatively, by integration with
respect to time:
Y =
�edt = LI
The inductance L of a circuit is
equal to the induced voltage divided by the rate of
change of current:
L = e / di/dt = dy/dt
/ di/dt = dy/di
Alternatively, the inductance L
of a circuit is equal to the magnetic linkage divided by
the current:
L = Y / I
Note that the magnetic linkage
Y is equal to the product
of the number of turns N and the magnetic flux
F:
Y = NF
= LI