Basic Qualification · B-005 Basic electronics and theory · B-005-009-009
Si vous branchez deux bobines de 20 millihenrys en parallèle, quelle est l'inductance de la combinaison?
- A40 millihenrys
- B80 millihenrys
- C5 millihenrys
- D10 millihenrys
Correct answer: D — 10 millihenrys. Question tirée de la banque officielle d'ISDE.
Why
When two identical inductors, which are coils that store energy in a magnetic field, are wired in parallel, the total inductance drops to exactly half of one component's value. 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