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Which grease suits electrical contacts?

  • A.Petroleum jelly, which excludes moisture effectively and is widely used upon battery terminals for that purpose
  • B.A dielectric or contact grease
  • C.Copper grease, which conducts and therefore improves the contact as well as excluding the moisture from the joint
  • D.Ordinary chassis grease

Answer: B

Dielectric grease excludes moisture without interfering with the metal to metal contact. Petroleum jelly genuinely is used on battery terminals for the same reason, which makes the last option a real practice on larger connections. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Checking which component actually carries the load settles most questions of this kind at once.

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