Question

What do u mean by the simple machine that has 80% efficiency

Answer 1

Answer:

It means that the machine converts 80% of the power of its input fuel source to actual work. There is 20% waste likely as heat, noise or wear.

Note that a machine powered by solar power is considered part of a 100% efficient system because rejected energy dissipated into the environment would have dissipated anyway. A lot of people don’t get this. Solar panels on their own are considered about 8% efficient (over 24 hours) but downstream losses have a different meaning.

Answer 2

Answer:

Hope it helps

Explanation:

It means that the machine converts 80% of input energy into output or useful energy and remaining 20% energy  is wasted due to friction.