Basic Qualification · B-005 Basic electronics and theory · B-005-003-011
You have acquired a transceiver and connected it to a power supply. When you switch on the power supply, its fuse blows immediately. What circuit malfunction caused the fuse to blow?
- A A short circuit
- B An open circuit
- C A resonant circuit
- D A closed circuit
Correct answer: A — A short circuit. From the official ISED question bank, verified word for word.
Why
A short circuit happens when electricity finds an unintended path with almost no resistance, causing a massive surge of current that melts the fuse instantly to protect the rest of the system. 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.