Question

What is the best defintion of efficency

Answer 1

Answer: Efficiency signifies a peak level of performance that uses the least amount of inputs to achieve the highest amount of output.

Explanation: It minimizes the waste of resources such as physical materials, energy, and time while accomplishing the desired output.

Answer 2

Answer:

The efficiency of a simple machine is defined as the ratio of useful work done by the machine ( output work) to the total work out into the machine ( input work).

Explanation:

Efficiency

If a machine overcomes a load ' L ' and the distance travelled by the load is 'Ld' , the work done by the load is L× LD. It is also called output work or useful work.

Therefore, $\boxed{Output \: work \: = L \: \times \: Ld}$

Likewise, The effort applied to overcome the load is 'E' and the distance covered by effort is 'Ed' , the work done by effort is E × Ed. It is also called input work.

Therefore, $\boxed{Input \: work = E \times Ed}$

The efficiency of a simple machine is defined as the ratio of output work to the input work .

Therefore, $\boxed{Efficiency ( η)= \frac{outpt \: work}{input \: work} \times 100\%}$

Efficiency is expressed in percentage. It is a ratio of two works. A machine is never 100% efficient. It is because no machine is friction free and due to friction, some of the input energy is wastes in the form of heat energy.

$\mathrm{Hope \: I \: helped!}$

$\mathrm{Best \: regards!}$