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ICSE Class 6 Answered

what is efficiency? how is it expressed?
Asked by moumitad72 | 19 Nov, 2014, 07:03: PM
answered-by-expert Expert Answer
Efficiency of a machine is the ratio of the useful work dne by the machine to the work output into the machine by the effort.
 
Or,it is the ratio of work output to the work input.
 
It is usually expressed in percentage and being a ratio of similar quantities,it has no unit.
 
Efficiency = (Work output / Work input) x 100 %
Answered by Sheetal Jalan | 19 Nov, 2014, 11:30: PM
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ICSE 6 - Physics
The load arm of a lever is 2 m long and and it's effort arm is 3 m long .what is the effort required to lift a load of 21N
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If load is less than effort than its formula
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ICSE 6 - Physics
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ICSE 6 - Physics
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