Question

1. A lightbulb uses 470J of energy and produces 180J of heat and 290J of light. Calculate the efficiency of the lightbulb.​

Answer 1

Step-by-step explanation:

The efficiency of a Bulb = Total Useful Energy/ Total Energy Supplied

Here in this particular case, Total Useful Energy is actually Light produced in Joules.

Therefore, Efficiency of the bulb = 290/470

=0.6170 or 61.70%