Question

What is the useful light output from a bulb of efficiency 0.25 when supplied with 600J of energy?



answer this pls

Answer 1

Answer:

Calculate the efficiency of a light bulb that gives of 40J of light from 200J of electrical energy.

=( )●100

= 40 200 =0.2 ● 100=20%

2. Calculate the percentage efficiency of a motor that does of 60J of light from 240J of electrical energy.

=( )●100

= 60 240 =0.25 ● 100=25%

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