Question

An ignition coil to start a car can produce as much as 25 kV. How does...

An ignition coil to start a car can produce as much as 25 kV. How does it get this voltage from 12 volts? Once you think you have the answer, ask yourself how it uses a battery to do this since a battery is a DC source.

Homework Answers

Answer #1

This setup is same as that of the step up transformer. The ignition coil is made of two coils of wire one with less number of turns or loops and the other with a large number of loops.Now by using a small inverter with the battery the DC current is first converted to AC current.

When current passes through the first coil a magnetic field is produced by the first coil. This magnetic field is then passed within the second coil with sufficiently high number of loops.

With AC current there is changing magnetic field because of the changing current . Hence the flux in the second loop also changes. As we know EMF is produced with changing flux and with hugh number of loops, The EMF will also be high as the EMF is dirrectly proportional to the number of loops.

So, again as I stated above the DC is first converted to AC.

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