here is an example of a motor vehicle 'ignition coil' which is in fact a transformer because it converts 'battery voltage' (12 Volts) into a higher voltage required by the 'spark plugs' to ignite the 'air-fuel' mixture. This is how the low 12 volts is converted into the high voltage required.
The ignition coil contains primary and secondary winding circuits. The primary winding contains 100 to 150 turns of heavy copper wire. The turns of this wire are insulated from each other so as not to create a short. The primary circuit wire goes into the coil through the positive terminal and exits through the negative terminal. The secondary winding circuit contains 15,000 to 30,000 turns of fine copper wire, which are also insulated from each other. As current flows through the coil a strong magnetic field is built up. When the current is shut off, the magnetic field collapses and induces a high voltage (in the secondary winding) which is released through the center terminal.
I hope that helps. You could also do some research about the function of transformers in Google. Simply type - How Transformers work - in Google Search.
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