Chapter 3 Part 20
Thus, in the secondary circuit is set up a series of currents alternating in direction, their periodicity depending upon the rate of interruption of the primary current. The inductive effect is augmented by the presence of the iron core, with its alternate magnetisations and demagnetisa- tions, which are in effect similar to rapid movements of a strong magnet alternately toward and away from the secondary windings. The E.M.F. or voltage of the secondary currents will depend upon and vary directly as—
1. The number of turns of wire in the coil;
2. The strength of the primary current; and
3. The suddenness of the break of the primary.
The strength, quantity, or amperagre, following Ohm’s law, will vary directly with those factors, and inversely as the resistance of the secondary circuit.
1. A very long secondary winding high E.M.F., with discharge sparks of great length; but its concomitant high resistance will prevent a great quantity of current passing, and the sparks will be correspondingly thin and thready.
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