Basic Qualification · B-005 Basic electronics and theory · B-005-003-002
If you have light bulbs marked 40 watts, 50 watts, 60 watts and 100 watts, which one will consume electrical energy at the highest rate?
- A The 40-watt bulb
- B The 100-watt bulb
- C The 60-watt bulb
- D The 50-watt bulb
Correct answer: B — The 100-watt bulb. From the official ISED question bank, verified word for word.
Why
The 100-watt bulb consumes energy at the highest rate because the wattage number printed on a light bulb directly tells you how much electrical power it uses every second. 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.