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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. Pass electricity through it
    2. b. Shine a light on it
    3. c. Turn it on
  3. 3. What is "incandescence"?
    1. a. When a light turns on
    2. b. The glass around a lightbulb
    3. c. When metals glow