Basic Qualification · B-004 Circuit components · B-004-006-005
On resistors with four colour bands, which colour band differentiates two resistors rated at 33 ohms and 39 ohms respectively?
- AFirst
- BSecond
- CThird
- DFourth
Correct answer: B — Second. From the official ISED question bank, verified word for word.
Why
The second colour band is the one that changes because it represents the second digit of the resistance value. The full explanation — and one for every question — is in Pro.
Practise this section
Circuit components is section B-004 of the Basic exam: The parts inside the box: resistors, capacitors, inductors, diodes, transistors, tubes and what each does in a circuit.
Drill B-004 — free, no account