Basic Qualification · B-005 Basic electronics and theory · B-005-004-003
How is the resistance in a DC circuit calculated when the voltage and current are known?
- A current
- B Resistance equals power divided by voltage
- C Resistance equals current divided by voltage
- D Resistance equals voltage divided by current
Correct answer: D — Resistance equals voltage divided by current. From the official ISED question bank, verified word for word.
Why
To find resistance when you know voltage and current, you simply divide the voltage by the current. 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.