Basic Qualification · B-003 Station assembly, practice and safety · B-003-016-004
Which of the following is a source of electromotive force (EMF)?
- A Metal-film resistor
- B Lithium-ion battery
- C Germanium diode
- D P-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
Building a station safely: power supplies, grounding, RF exposure, lightning, feedline routing, and what a transmitter, receiver and transceiver actually do.