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Read the story and answer the questions to test your comprehension.

Incandescence is when some metals glow as an electrical current passes through them. People had been trying to make an incandescent light for almost a century before Edison came along. He settled on carbon, but one of Edison's first light bulb designs featured a piece of carbonized bamboo.

  1. 1. What kind of fiber did Edison's first light bulb use?
    1. a. Willow
    2. b. Oak
    3. c. Bamboo
  2. 2. How do you make a metal glow?
    1. a. Turn it on
    2. b. Pass electricity through it
    3. c. Shine a light on it
  3. 3. What is "incandescence"?
    1. a. When metals glow
    2. b. When a light turns on
    3. c. The glass around a lightbulb