Recent content by klorin

I think the keyword is "relevant power sources". What is your understanding of this sentence?

Is this question the bulbs are normal tungsten bulb and the efficiency is 100% (all heat energy is converted to light energy)

I came across a question: Four bulbs with different power rating, bulb A (240V, 40W), bulb B (110V, 36W), bulb C (12V, 60W) and bulb D (6V, 0.5W) are connected to relevant power sources. Which bulb is the brightest. At first, i thought the highest power will be the brightest. But the answer is...