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Nataly_w [17]
3 years ago
15

How is the mechanical efficiency of a machine usually expressed?

Physics
1 answer:
coldgirl [10]3 years ago
3 0

Answer:

As a percentage

Explanation:

The mechanical efficiency of a machine is the percentage of energy in input to the machine that is converted into useful work.

Mathematically, the efficiency of a machine is given by:

\eta=\frac{W}{E}\cdot 100

where:

W is the useful work in output from the machine

E is the energy in input to the machine

For example, a machine with 80% efficiency means that it converts 80% of the input energy into work.

A machine can never be 100% efficient, since part of the input energy is wasted due to the presence of frictional forces.

So, the efficiency of a machine is expressed as a percentage.

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