Basic Qualification · B-005 Basic electronics and theory · B-005-007-001
What is the term for the number of times per second an alternating current completes a positive to negative cycle?
- A Speed
- B Pulse rate
- C Phase
- D Frequency
Correct answer: D — Frequency. From the official ISED question bank, verified word for word.
Why
Frequency measures how many times an alternating current swings from positive to negative and back again in one second. The full explanation — and one for every question — is in Pro.
Practise this section
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.