Basic Qualification · B-005 Basic electronics and theory · B-005-006-009
What is the power consumption of two 10-ohm resistors connected in series with a 10-volt battery?
- A 5 watts
- B 2 watts
- C 20 watts
- D 0.5 watts
Correct answer: A — 5 watts. From the official ISED question bank, verified word for word.
Why
With two 10-ohm resistors in series, the total resistance becomes 20 ohms, which limits the current flowing from the 10-volt battery to 0.5 amperes. 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.