Final answer:
In a low-tension ignition system, there is typically one secondary coil used to step up the voltage and create a spark.
Step-by-step explanation:
In a low-tension ignition system, there is typically one secondary coil used. The secondary coil is responsible for stepping up the voltage from the primary coil to create a spark at the spark plugs.
A low-tension ignition system works by using a low voltage to create a magnetic field in the primary coil. When the magnetic field collapses, it induces a high voltage in the secondary coil, which is then used to create a spark.
So, to answer your question, there is usually one secondary coil used in a low-tension ignition system.