Basic Qualification · B-005 Basic electronics and theory · B-005-004-002
How is the current in a DC circuit calculated when the voltage and resistance are known?
- ACurrent equals resistance divided by voltage
- BCurrent equals power divided by voltage
- CCurrent equals voltage divided by resistance
- DCurrent equals resistance multiplied by voltage
Correct answer: C — Current equals voltage divided by resistance. From the official ISED question bank, verified word for word.
Why
Current equals voltage divided by resistance because voltage acts like electrical pressure pushing electrons through a circuit, while resistance opposes that flow; dividing the pressure by the opposition tells you exactly how much current moves. 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