Basic Qualification · B-005 Basic electronics and theory · B-005-006-010
What is the advantage of replacing a 50-ohm resistor with a parallel combination of two 100-ohm resistors of the same power rating?
- A Lesser resistance and same power rating
- B Same resistance but greater power rating
- C Same resistance but lesser power rating
- D Greater resistance and same power rating
Correct answer: B — Same resistance but greater power rating. From the official ISED question bank, verified word for word.
Why
Two 100-ohm resistors in parallel create a total resistance of 50 ohms, matching the original single resistor, but because the electrical current splits between them, each component handles only half the load. 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.