Which end does not include a ground electrode?

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Multiple Choice

Which end does not include a ground electrode?

Explanation:
In spark plug design, the ground electrode forms the spark gap with the center electrode at the end that sits in the combustion chamber—the firing end. The opposite end, where the plug connects to the ignition coil and where no spark occurs, is described in this context as the semi-surface end and does not have a ground electrode. So, the end that does not include a ground electrode is the semi-surface end. (Terms like projected end refer to the geometry of the center electrode, not the presence of a ground electrode, and heat-range wording isn’t about ends.)

In spark plug design, the ground electrode forms the spark gap with the center electrode at the end that sits in the combustion chamber—the firing end. The opposite end, where the plug connects to the ignition coil and where no spark occurs, is described in this context as the semi-surface end and does not have a ground electrode. So, the end that does not include a ground electrode is the semi-surface end. (Terms like projected end refer to the geometry of the center electrode, not the presence of a ground electrode, and heat-range wording isn’t about ends.)

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