Basic Qualification · B-005 Basic electronics and theory · B-005-002-002
Which of these groups lists three good electrical insulators?
- AWood, copper and porcelain
- BGlass, air and porcelain
- CPlastic, wood and carbon
- DTeflon, mica and aluminum
Correct answer: B — Glass, air and porcelain. From the official ISED question bank, verified word for word.
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