What is an important characteristic of a properly functioning ignition coil?

A properly functioning ignition coil is essential in an internal combustion engine as it transforms battery voltage into high voltage. The ignition coil takes the low voltage from the battery (typically around 12 volts) and steps it up to thousands of volts, which is necessary to create a spark at the spark plug. This high voltage is crucial for igniting the air-fuel mixture in the combustion chamber, enabling the engine to start and run efficiently.

The process involves electromagnetic induction, where the coil generates a high-voltage pulse in response to the rapid changes in electrical current. This characteristic is fundamental to the ignition system's performance, as a weak or defective coil can lead to misfires, hard starting, or stalling of the engine.

Other choices like producing a steady low voltage, regulating oil supply, or controlling fuel injection timing do not pertain to the function of the ignition coil. Therefore, they are not relevant in identifying the key characteristics of a properly functioning ignition coil.