Basic Qualification · B-005 Basic electronics and theory · B-005-002-007
The letter "R" is the symbol for:
- A impedance
- B reluctance
- C reactance
- D resistance
Correct answer: D — resistance. From the official ISED question bank, verified word for word.
Why
In any electrical circuit, "resistance" is the property that opposes the flow of electric current, and the letter "R" is the standard symbol used to represent this concept in formulas and diagrams. 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.