Basic Qualification · B-005 Basic electronics and theory · B-005-003-004
A circuit consists of a battery and load resistor. What circuit malfunction would cause no current to be drawn from the battery?
- A A short circuit
- B A reactive circuit
- C A closed circuit
- D An open circuit
Correct answer: D — An open circuit. From the official ISED question bank, verified word for word.
Why
An open circuit means the path for electricity is broken, like a switch left off or a wire snapped, so electrons cannot flow from the battery to the load resistor. 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.