Immediately after the Civil War, they sought to give meaning to freedom by reuniting families separated under slavery, establishing their own churches and schools, seeking economic autonomy, and demanding equal civil and political rights.
An ignition coil (also called a spark coil) is an induction coil in an automobile 's ignition system which transforms the battery's low voltage to the thousands of volts needed to create an electric spark in the spark plugs to ignite the fuel.uch smaller coils are used with one coil for each spark plug or one coil serving two spark plugs (for example two coils in a four-cylinder engine, or three coils in a six-cylinder engine). A large ignition coil puts out about 40 kV, and a small one such as from a lawn mower puts out about 15 kV.
Before discussing coil differences, it is important to understand the basic operation of an ignition coil. The function of any ignition coil is to convert a low voltage (12 volts or less) into a voltage high enough (25,000-plus volts) to jump the spark plug gap and ignite the fuel-air mixture in the engine cylinder. It performs this function by making use of the principle of induction.