Basic Qualification · B-005 Basic electronics and theory · B-005-005-002
You connect four 100-ohm resistors in parallel across a 12-volt battery. How many milliamperes of current are drawn from the battery?
- A240 mA
- B480 mA
- C48 mA
- D120 mA
Correct answer: B — 480 mA. From the official ISED question bank, verified word for word.
Why
When four identical 100-ohm resistors sit side by side in parallel, the total resistance drops to 25 ohms because the electricity has four paths to flow through instead of one. 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