Basic Qualification · B-005 Basic electronics and theory · B-005-008-007
The power output from a transmitter increases from 1 watt to 2 watts. How many decibels does that increase represent?
- A1 dB
- B3 dB
- C10 dB
- D6 dB
Correct answer: B — 3 dB. From the official ISED question bank, verified word for word.
Why
Doubling the power from 1 watt to 2 watts represents a gain of exactly 3 decibels, a standard rule in radio physics where every time you multiply power by two, you add 3 dB to the level. The full explanation — and one for every question — is in Pro.
Practise this section
Basic electronics and theory is section B-005 of the Basic exam: The theory: Ohm's law, power, series and parallel circuits, AC and DC, frequency and wavelength, decibels, and the metric prefixes the exam leans on.
Drill B-005 — free, no account