SSC
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which statement is correct?
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Energy is always lost as energy changes are terribly inefficient.
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Energy is never lost it merely changes type and becomes less useful.
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Energy is never lost as it can always be recovered.
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Energy is usually lost in old products as they are inefficient.
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Explanation:
Detailed explanation-1: -yes and no. Energy cannot be created or destroyed, but it can change from more-useful forms into less-useful forms.
Detailed explanation-2: -In every energy transfer, some amount of energy is lost in a form that is unusable. In most cases, this form is heat energy. Thermodynamically, heat energy is defined as the energy transferred from one system to another that is not doing work.
Detailed explanation-3: -The principle of the conservation of energy refers to the idea that energy is not created or lost – it is only transformed from one form to another. In all changes some energy is always converted into forms (mainly low grade heat) that cannot be used to make further changes.
There is 1 question to complete.