Basic Qualification · B-005 Basic electronics and theory · B-005-004-001
What is the voltage across a 2-ohm resistor if a current of 0.5 amperes flows through it?
- A 2.5 volts
- B 1.5 volts
- C 1.0 volts
- D 0.25 volts
Correct answer: C — 1.0 volts. From the official ISED question bank, verified word for word.
Why
To find the voltage across a resistor, you multiply the current flowing through it by its 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.