Basic Qualification · B-005 Basic electronics and theory · B-005-005-007
Which of these series combination of resistors would replace a single 120-ohm resistor?
- A Two 240-ohm resistors
- B Five 100-ohm resistors
- C Five 24-ohm resistors
- D Six 22-ohm resistors
Correct answer: C — Five 24-ohm resistors. From the official ISED question bank, verified word for word.
Why
Five 24-ohm resistors work because when resistors are connected in a series, their resistance values simply add together. 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.