A particular lightbulb produces 8 J of thermal energy while producing 2 J of radiant energy, and this is its entire energy output during this time. How energy- efficient is this bulb [as a producer of light]?

Question

Quizplus · Accepted Answer

The energy efficiency of the bulb as a producer of light is calculated by dividing the radiant energy output (2 J) by the total energy output (8 J + 2 J = 10 J), which gives 0.2 or 20%.

A Particular Lightbulb Produces 8 J of Thermal Energy While