Assertion: coil's voltage | /r/Causes | spark
Facets:
Source sentences:
text: The high voltage from the coil's secondary (typically 20,000 to 50,000 volts) causes a spark to form across the gap of the spark plug that in turn ignites the compressed air-fuel mixture within the engine.
text: An ordinary ignition system has points that when they shut they cause the coil to energise and when they open the coil tries to keep the electric there but cannot causing a high voltage that is dissapated thru the plug causing a spark.