Basic Qualification · B-005 Basic electronics and theory · B-005-004-004
How is the voltage in a DC circuit calculated when the current and resistance are known?
- A Voltage equals power divided by current
- B Voltage equals current multiplied by resistance
- C Voltage equals current divided by resistance
- D Voltage equals resistance divided by current
Correct answer: B — Voltage equals current multiplied by resistance. From the official ISED question bank, verified word for word.
Why
Voltage is the electrical pressure that pushes current through a resistance. 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.