In order for a spark plug in the combustion chamber to spark at all, there must be a voltage of at least 30,000 V between the spark plug electrodes. The battery, however, provides only 12 V of voltage. Thus, the battery voltage must be repeatedly increased. The duration of the flash is not tenths or hundredths, but thousandths of a second. If it fires a little earlier or later, the ignition efficiency, and thus the engine power, will be reduced.
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