- The changing magnetic field created by one circuit (the primary) can induce a changing voltage and/or current in a second circuit (the secondary).
- The mutual inductance, M, of two circuits describes the size
of the voltage in the secondary induced by changes in the current
of the primary:
change in I (primary) V(secondary) = - M * ---------------------- change in time - The units of mutual inductance are henry, abbreviated "H".
- A circuit can create changing magnetic flux through itself,
which can induce an opposing voltage in itself. The size of that
opposing voltage is
change in I V(opposing) = - L * ------------- change in timewhere L is the self-inductance of the circuit, again measured in henries.
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