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EarlyBay Forums
Technical
Horn sounding when keys touch the steering collumn
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<blockquote data-quote="naskeet" data-source="post: 634860" data-attributes="member: 15903"><p>It distresses me to learn of people who put themselves, others or their vehicles at risk through lack of appropriate knowledge; one of the penalties of being a long-term educator.</p><p></p><p>When the engine isn't running, current only flows in the primary coil if the contact-breaker points are closed, but under these circumstances it is a constant current so there is no rate of change of magnetic flux to induce a current in the secondary coil.</p><p></p><p>Hence the primary coil provides solely resistance to the flow of steady current rather than resistance & inductive impedance to a rapidly changing current. More current is flowing and for a longer uninterrupted duration, so one would anticipate a greater heating effect.</p><p></p><p>With no high-voltage back-EMF induced in the primary coil, there would be no effect on the capacitor (aka condenser) and given that no high-voltage current is induced in the secondary coil, the HT cables, rotor-arm and distributor cap are irrelevant.</p></blockquote><p></p>
[QUOTE="naskeet, post: 634860, member: 15903"] It distresses me to learn of people who put themselves, others or their vehicles at risk through lack of appropriate knowledge; one of the penalties of being a long-term educator. When the engine isn't running, current only flows in the primary coil if the contact-breaker points are closed, but under these circumstances it is a constant current so there is no rate of change of magnetic flux to induce a current in the secondary coil. Hence the primary coil provides solely resistance to the flow of steady current rather than resistance & inductive impedance to a rapidly changing current. More current is flowing and for a longer uninterrupted duration, so one would anticipate a greater heating effect. With no high-voltage back-EMF induced in the primary coil, there would be no effect on the capacitor (aka condenser) and given that no high-voltage current is induced in the secondary coil, the HT cables, rotor-arm and distributor cap are irrelevant. [/QUOTE]
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Horn sounding when keys touch the steering collumn
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