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Why does one bulb glow brighter than another?

Compare circuits to understand brightness.

ScienceClass 101–2 min video + interactive
Topic lesson preview1:34
Step 1 of 4
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What you'll learn

  1. 1How shadows are formed
  2. 2Why shadow size changes
  3. 3How light position affects shadows

What happens next

Watch short videoSee how shadows change size in real life.Try the circuit experimentChange the conditions and see what happens.Quick check quizTest what you've learned.
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