Basic Qualification · B-005 Basic electronics and theory · B-005-004-007
If the current flowing through a 50-ohm resistor is 0.44 amperes, what voltage would you measure across the resistor?
- A 0.22 volts
- B 22 volts
- C 222 volts
- D 2.2 volts
Correct answer: B — 22 volts. From the official ISED question bank, verified word for word.
Why
To find the voltage across the resistor, you multiply the current by the resistance, a rule known as Ohm's Law. 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.