Basic Qualification · B-005 Basic electronics and theory · B-005-002-002
Lequel des groupes suivants montre trois bons isolants électriques?
- ABois, cuivre et porcelaine
- BVerre, air et porcelaine
- CPlastique, bois et carbone
- DTeflon, mica et aluminium
Correct answer: B — Verre, air et porcelaine. Question tirée de la banque officielle d'ISDE.
Why
Glass, air, and porcelain are excellent insulators because their atoms hold onto electrons tightly, preventing electric current from flowing through them easily. 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