Basic Qualification · B-005 Basic electronics and theory · B-005-007-010
What is the shape of the waveform of the electricity supplied from a household receptacle?
- A Complex wave
- B Modified square wave
- C Pulse wave
- D Sine wave (sinusoidal)
Correct answer: D — Sine wave (sinusoidal). From the official ISED question bank, verified word for word.
Why
Household electricity in Canada flows back and forth in a smooth, repeating curve that looks like a gentle hill followed by a gentle valley, which engineers call a sine wave. 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.