Wiring and componentsQuestion 795 of 1506

Which type of material tends to be a very good insulator?

  1. Graphite
  2. Silver
  3. Copper
  4. Hydrocarbon compounds such as oils
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Correct answer: Hydrocarbon compounds such as oils

Oils are made of hydrocarbons, which hold their electrons.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 12.1: 12.1 Introduction to Conductance and Conductors

Practice wiring and components

Questions last reviewed: 18 October 2026