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Telecom Foundations

Decibels (dB) and dBm

interactive3 min

Lesson 11 of 24

Card 1 of 617%

Warm-up: Guess before you learn

Try these first, even if you're not sure. Guessing primes your brain.

Why do engineers use decibels instead of raw watts for signal?

A tower transmits 20 watts. How much reaches your phone?

Your phone shows -70 dBm; a friend shows -100. Who is stronger?

Answer all 3to continue — it's OK to be wrong.

All lessons in this level: