Basic Qualification · B-005 Basic electronics and theory · B-005-004-010
What formula calculates the resistance of a circuit when the voltage and current are known?
- AR = E x I
- BR = E / I
- CR = I / E
- DR = E squared / I
Correct answer: B — R = E / I. From the official ISED question bank, verified word for word.
Why
To find resistance when you know voltage and current, you divide the voltage by the current. The full explanation — and one for every question — is in Pro.
Practise this section
Basic electronics and theory is section B-005 of the Basic exam: 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.
Drill B-005 — free, no account