Excerpt from Linkage-Current Diagram for Representing Magneto Operation The graph of secondary flux turns thus obtained still satisfies the important requirement that areas between any curve and the axis of ordinates represent energy transformed, since the ordinates have been decreased in the same ratio as that by which the abscissas have been increased.
It may also be shown (see Appendix B) that the secondary graph thus obtained will precisely coincide with the primary graph even if the coupling is loose, provided only that the ratio n (as defined by equation (7b)) is truly a constant and does not vary when meas ured at different flux densities and that current is flowing in one circuit only. Experimental confirmation of this result is shown in Figure 2. This gives the N - l curve for a spark coil. The crosses were obtained from measurements of primary flux turns and primary current and the circles from similar measurements on the secondary. If the coupling is close (as is always the case in ignition apparatus), this coincidence also holds with sufficient accuracy for those parts of the cycle during which current is flowing in both circuits if the abscissas are taken as [1 n 12.
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