Secondary wire is used to power what?

Secondary wire is specifically used to deliver the high voltage generated by the ignition coil to the spark plugs. This wire is crucial in the ignition system of an internal combustion engine, as it ensures that the spark plugs receive the necessary voltage to create a spark, which is needed to ignite the air-fuel mixture in the combustion chamber. The functioning of the ignition system hinges on the effective transfer of this high voltage through the secondary wire to maintain engine performance and efficiency.

In contrast, the other options do not correctly match the purpose of secondary wire. Fuses are part of the electrical protection circuit and are not powered directly by the secondary wire. Battery terminals connect to the battery and distribute power but do not utilize secondary wire. Sensors in the automotive system may use different types of wiring but are not powered by secondary wire designated for spark plugs.