Basic Qualification · B-003 Station assembly, practice and safety · B-003-016-004
Lequel des dispositifs suivants est une source de force électromotrice (f.é.m.)?
- AUne batterie lithium-ion
- BUne diode au germanium
- CUn transistor à effet de champ à canal P
- DUne résistance à couche métallique
Correct answer: A — Une batterie lithium-ion. Question tirée de la banque officielle d'ISDE.
Why
A Lithium-ion battery is right because it acts as a chemical pump that pushes electrons through a circuit, creating the voltage needed to make current flow. The full explanation — and one for every question — is in Pro.
Practise this section
Station assembly, practice and safety is section B-003 of the Basic exam: Building a station safely: power supplies, grounding, RF exposure, lightning, feedline routing, and what a transmitter, receiver and transceiver actually do.
Drill B-003 — free, no account