Basic Qualification · B-003 Station assembly, practice and safety · B-003-016-004
Which of the following is a source of electromotive force (EMF)?
- AMetal-film resistor
- BLithium-ion battery
- CGermanium diode
- DP-channel FET
Correct answer: B — Lithium-ion battery. From the official ISED question bank, verified word for word.
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