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Run it in class

WiFi, Bluetooth, infrared — why does a TV remote need to point, but your phone doesn't?

Show of hands — before you project anything

Predict first: if a wall drops between you and the TV, which signal gets blocked — infrared, WiFi, or Bluetooth? Explain your reasoning before testing.

  • A Way more than you'd guess
  • B About what you'd guess
  • C Way less than you'd guess

Count the votes out loud. Hold them to it — then watch.

Project it (fullscreen)

Discussion prompts

  • Predict first: if a wall drops between you and the TV, which signal gets blocked — infrared, WiFi, or Bluetooth? Explain your reasoning before testing.
  • Infrared, WiFi, and Bluetooth are all invisible. What single difference decides whether a wall stops them?
  • Bluetooth and WiFi are both radio and both pass through walls — so what makes them different from each other?

Where it shows up in real life

  • Aiming a TV or air-conditioner remote across the room
  • Streaming music to earbuds or a speaker from your pocket through a wall
  • Joining the home WiFi from a bedroom without pointing your phone anywhere

A prediction-first worksheet — no answer key.

zero prep · no login · any projector

Winding down at home? Family mode · Explore every question