Basic Qualification · B-005 Basic electronics and theory · B-005-004-011
What is the resistance of a circuit if it draws 300 milliamperes from a 3-volt battery?
- A 9 ohms
- B 5 ohms
- C 3 ohms
- D 10 ohms
Correct answer: D — 10 ohms. From the official ISED question bank, verified word for word.
Why
To find the resistance, you must first change 300 milliamperes into 0.3 amperes, then divide the 3-volt battery voltage by this current. 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.