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Which component insulates the high voltage on its way to the plug?

  • A.The spark plug insulator, which surrounds the centre electrode and prevents the voltage from tracking to the shell
  • B.The high tension lead with its silicone insulation
  • C.The distributor cap, which encloses the rotor and therefore prevents the voltage from escaping to the engine
  • D.The coil

Answer: B

High tension leads carry tens of thousands of volts and their insulation must resist tracking. The cap and the plug insulator genuinely perform the same function in their own places, which makes both alternatives true of different components. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Naming what changes and what stays the same is the reliable route through questions of this shape. Checking the units of each quantity catches a wrong formula before the arithmetic begins.

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