Advanced Qualification · A-007 Feedlines and matching · A-007-004-007
At the ends of a half-wave dipole:
- A voltage is low and current is high
- B voltage is high and current is low
- C voltage and current are both high
- D voltage and current are both low
Correct answer: B — voltage is high and current is low. From the official ISED question bank, verified word for word.
Why
At the very ends of a half-wave dipole, the radio wave reflects back, creating a standing wave where the electrical pressure, or voltage, builds up to its maximum while the flow of electrons, known as current, drops to nearly zero. The full explanation — and one for every question — is in Pro.
Practise this section
Feedlines and matching at the advanced level: transmission line theory, impedance transformation, stubs and matching networks.