Basic Qualification · B-005 Basic electronics and theory · B-005-006-006
If the voltage applied to two resistors in series is doubled, how much will the total power change?
- ADecrease to half
- BDouble
- CDecrease to one quarter
- DIncrease four times
Correct answer: D — Increase four times. From the official ISED question bank, verified word for word.
Why
When you double the voltage across resistors in series, the power they consume increases four times because power depends on the square of the voltage. The full explanation — and one for every question — is in Pro.
Practise this section
Basic electronics and theory is section B-005 of the Basic exam: 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.
Drill B-005 — free, no account