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Home Electrical Fundamentals of Communication Mutual Inductance  


Mutual InductanceThis is defined^{1} as "the common property of two associated electric circuits which determines, for a given rate of change of current in one of the circuits, the electromotive force induced in the other. Thus,
where e_{1} and i_{1} are in circuit 1, e_{2} and i_{2} are in circuit 2, and M is the coefficient of mutual inductance." In these equations e is the instantaneous voltage in volts, M is the mutual inductance in henrys, and di/dt is the instantaneous rate of change of current in amperes per second. It is possible to write a form similar to that of equation 3.
For steadystate sinusoidal conditions and effective values, it can be shown that
For convenience in applying to a transformer this equation has been written in terms of the effective value of the magnitude of the secondary voltage E_{s} induced by the effective value of the primary current I_{p}. The units are volts, amperes, and cycles per second. If phase relations are of importance a j should be placed in front of the final expressions of equation 8.


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