A student funds some information about energy saving light bulbs a 30W light bulb uses 600J of electrical energy in - Physics - Heat and Energy

Question

A student funds some information about energy saving light bulbs a
30W light bulb uses 600J of electrical energy in a certain period
of time in that time it produces 450J of light energy the rest of
the energy is wasted calculate the efficient of the light bulb

Sanat K Mukherjee · Accepted Answer

Solution,
Efficiency=Useful energy outputEnergy input×100%Efficiency=450 J600 J×100%=75%

A student funds some information about energy saving light bulbs a 30W light bulb uses 600J of electrical energy in a certain period of time in that time it produces 450J of light energy the rest of the energy is wasted calculate the efficient of the light bulb