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| Keywords: Induction coil waveforms.svg Waveforms of voltage and current in an induction coil without a capacitor demonstrating how the coil's interrupter works to generate the high voltages The <font color blue >blue</font> trace <font color blue >i<sub>1</sub></font> is the current in the coil's primary winding It is broken periodically by a vibrating contact in the primary circuit called an interrupter The changes in current create a changing magnetic flux in the coil which induces a high voltage in the secondary coil <font color red >v<sub>2</sub></font> shown in <font color red >red</font> The voltage induced in the secondary is proportional to the rate of change of the primary current Both the closing and opening of the interrupter contacts induce pulses of voltage of opposite polarity in the secondary But the current change is much more abrupt on the opening or break of the contacts and this generates the high voltage spikes produced by the coil <br /><br /> These are not the waveforms of ordinary induction coils because most induction coils have a capacitor across the interrupter contacts which increases the rate of current change on break and results in much higher secondary voltages This causes the waveforms at break to be oscillatory a damped sinusoidal wave See Induction coil waveforms with capacitor svg Informatin from http //books google com/books id e-hMAAAAMAAJ pg PA3 Louis Denton Bliss 1922 Theoretical and practical electrical engineering 2nd Ed The Bliss Electrical School p 3 fig 676 own 2010-10-10 Chetvorno I Chetvorno Chris Burks the author of this work release it to the public domain for any use whatever Induction coil waveforms de svg Cc-zero Induction coils | ||||
