Basic Qualification · B-005 Basic electronics and theory · B-005-005-009
Quelle est la résistance totale de quatre résistances de 68 ohms raccordées en parallèle?
- A272 ohms
- B17 ohms
- C12 ohms
- D34 ohms
Correct answer: B — 17 ohms. Question tirée de la banque officielle d'ISDE.
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
Basic electronics and theory is section B-005 of the Basic exam: 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.
Drill B-005 — free, no account