Basic Qualification · B-005 Basic electronics and theory · B-005-004-006
What value of resistance is required to drop 9 volts with a current of 10 milliamperes?
- A 90 ohms
- B 9 ohms
- C 9000 ohms
- D 900 ohms
Correct answer: D — 900 ohms. From the official ISED question bank, verified word for word.
Why
To find the resistance needed to drop 9 volts with a current of 10 milliamperes, you must first convert the current to amperes, which is 0.01 amperes, then divide the voltage by this current using Ohm's Law. 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.