Infrared thermometer and headphones: what they have in common

1. Step 1. Infrared thermometer — uses — Infrared radiation. The infrared radiation of a body.
2. Step 2. Infrared radiation — is used in — Remote control. An infrared signal.
3. Step 3. Remote control — has part — Printed circuit board. Inside a remote is a circuit board with buttons and an infrared LED.
4. Step 4. Printed circuit board — has part — Copper wire. Copper traces.
5. Step 5. Copper wire — is part of — Headphones. A cable.

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