Basic Qualification · B-005 Basic electronics and theory · B-005-006-002
A load requires 12 volts DC at 5 amperes. What is the minimum required power transformer rating?
- A 6 watts
- B 60 watts
- C 17 watts
- D 2.4 watts
Correct answer: B — 60 watts. From the official ISED question bank, verified word for word.
Why
To find the power needed, multiply the voltage by the current: 12 volts times 5 amperes equals 60 watts. 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.