The energy output of a machine is 20j, if the efficiency of the machine is 80%, calculate the energy input
20/0.8 = ___ J
Please help me
25%
To calculate the energy input of the machine, we can use the concept of efficiency. Efficiency is defined as the ratio of useful output energy to the total input energy.
Mathematically, efficiency (%) = (useful output energy / total input energy) * 100
Given that the efficiency of the machine is 80%, we can rewrite the equation as follows:
80% = (useful output energy / total input energy) * 100
To find the energy input, we need to rearrange the equation:
Total input energy = useful output energy / (efficiency / 100)
Total input energy = 20 J / (80 / 100)
Total input energy = 20 J / 0.8
Simplifying the equation, we get:
Total input energy = 25 J
Therefore, the energy input of the machine is 25 J.