Energy can be transferred from one form to another, but it cannot be destroyed or created. So it can be conserved if efficiently used. Thus efficient usage of energy lead to conservation of energy. Due to conservation of energy, the forces can be renewable and non-renewable.
So, we should know how the input energy can be completely converted to another form of energy leading to efficient usage of energy without any loss. As if there is no loss, input energy will be equal to output energy leading to 100% efficiency.
It is to find an unbiased group of people unrelated to the event and it is a way for even the least patriotic citizens to serve their country. It also means there IS A JURY, if there wasn't; then it would come done to the whims of the judge.