Answer Posted / baskaran.r
the spark plug will operate at a voltage of 3000volts to
15000volts. when engine is at minimum speed only 15000volts
will be available as ignition coil core will be getting full
time DC voltage. when running at a higher rpm the voltage
reduces as the time available for magnetising the core. that
is why it is advised to run cars at a speed less than 60 km.
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