Basic Qualification · B-005 Basic electronics and theory · B-005-005-006
What is the total resistance of five 10-ohm resistors in series?
- A 2 ohms
- B 50 ohms
- C 5 ohms
- D 10 ohms
Correct answer: B — 50 ohms. From the official ISED question bank, verified word for word.
Why
When resistors are connected in series, the electric current must flow through each one in turn, so their individual opposition to the flow simply adds up. 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.