# Thread: represented by the "fuel"

1. ## represented by the "fuel"

This "represented" is translated as "make" but what does it exactly mean?

is101
ex)The scientist endeavors not only to produce power as efficiently and cheaply as possible, but also to apply it economically... In using energy to produce light, a vast amount is wasted as heat. With the electric lamp, by far the greater part of the energy represented by the "fuel" is thrown away as heat and only two percent is turned into light...

2. ## Re: represented by the "fuel"

As you can see, an incandescent light bulb is highly inefficient. Most of the energy that goes in is not used for usueful work, but is lost as heat. You could calculate the efficiency of the light bulb by using this formula, .

This is just the rewritten formula of η = (Eout/Ein)* 100% (since E = P * t). Ein is the total amount of energy in joules that you put in. Since η never equals 100%, some energy is always lost as heat.

Edit. It's not a very well written sentence in my view. Energy is not represented by fuel. Fuel can be burnt to produce energy and heat.

3. ## Re: represented by the "fuel"

Represented does not mean make or anything concrete here. It means 'calculated' or 'figured' or 'considered', all mental representations, or thoughts.

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