DC circuitsQuestion 195 of 1506

A technician squeezes a certain crystal and a small voltage appears. Which source of electrical force is this?

  1. Heat
  2. Friction
  3. Pressure
  4. Light
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Correct answer: Pressure

Some crystals make electricity when they are squeezed under extreme pressure.

Source: Electrical Fundamentals Competency (Industry Training Authority of BC), 1.1: Basic principles

Practice dc circuits

Questions last reviewed: 18 October 2026