Spark Plugs
Chapter 3 Basics of Ignition
36
Self-induction
action
When you change the current flowing
through one coil, its magnetic flux also
changes and induced electromotive
power is generated in the coil.
This phenomenon is called self-induction
action. The induced electromotive power
works to obstruct the change in the
current.
Therefore, when current is passed
through a coil, the self-induction action
works to obstruct that current, so it
takes time for the current to flow into
the coil.
This phenomenon is called the primary
current rise time.
Current
Counter-electromotive force due to self-induction
2
2
1
1
Switched off
Switched on
Reference
1
1
2
2
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