Basic Qualification · B-004 Circuit components · B-004-006-007
Out of the list of resistor tolerances below, which has the lowest precision?
- A20%
- B0.1%
- C5%
- D10%
Correct answer: A — 20%. From the official ISED question bank, verified word for word.
Why
A 20% tolerance means the actual resistance can vary by one-fifth of the stated value, creating the widest possible range of error and therefore the lowest precision. 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