Basic Qualification · B-005 Basic electronics and theory · B-005-005-009
What is the total resistance of four 68-ohm resistors wired in parallel?
- A 34 ohms
- B 272 ohms
- C 17 ohms
- D 12 ohms
Correct answer: C — 17 ohms. From the official ISED question bank, verified word for word.
Why
When four identical resistors are wired in parallel, the total resistance drops because the electricity has four separate paths to flow through instead of one. 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.