A machine is 65 percent of efficient
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Efficiency = Work output/Work input * 100
So, 65% Efficiency means it’s work output : work input = 13 : 20
i.e, You are providing the machine with 20 units energy and it is giving you back 13 units energy.
The remaining 35% is dissipated in form of other energy (mainly heat) .
This happens mainly because the parts of the machine are not completely weightless, Strings (if present) are elastic in nature and the parts aren’t perfectly rigid thus producing heat due to friction.
So, 65% Efficiency means it’s work output : work input = 13 : 20
i.e, You are providing the machine with 20 units energy and it is giving you back 13 units energy.
The remaining 35% is dissipated in form of other energy (mainly heat) .
This happens mainly because the parts of the machine are not completely weightless, Strings (if present) are elastic in nature and the parts aren’t perfectly rigid thus producing heat due to friction.
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