Basic Qualification · B-005 Basic electronics and theory · B-005-008-002
What change in transmitter power results in a 3 dB decrease?
- A Divide the original power by 4
- B Divide the original power by 2
- C Divide the original power by 1.5
- D Divide the original power by 3
Correct answer: B — Divide the original power by 2. From the official ISED question bank, verified word for word.
Why
A 3 dB decrease means the power has been cut exactly in half, so you must divide the original power by 2. The full explanation — and one for every question — is in Pro.
Practise this section
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.