Basic Qualification · B-005 Basic electronics and theory · B-005-006-003
What is the DC input power of a transmitter operating at 12 volts and drawing 500 milliamperes?
- A 600 watts
- B 6 watts
- C 24 watts
- D 60 watts
Correct answer: B — 6 watts. From the official ISED question bank, verified word for word.
Why
To find the power, multiply the voltage by the current, but first convert milliamperes to amperes by dividing by one thousand, turning 500 milliamperes into 0.5 amperes. 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.