Basic Qualification · B-005 Basic electronics and theory · B-005-006-011
Resistor wattage ratings are:
- Aexpressed in joules
- Bvariable in steps of one hundred
- Cdetermined by heat dissipation qualities
- Dcalculated according to physical size tolerance rating
Correct answer: C — determined by heat dissipation qualities. From the official ISED question bank, verified word for word.
Why
A resistor's wattage rating tells you how much power it can safely turn into heat without burning out, so the rating is determined by heat dissipation qualities. 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