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Energy Efficiency
No. In heat energy, there is always a certain amount of unusable energy. What amount depends on the availability of colder objects.
friction
Any time there is an energy conversion, a certain amount of one type of energy gets reduced, and another type of energy increases. The amounts lost and gained are the same, so total energy is conserved.
No, energy is not produced. The total amount of energy doesn't change.
Energy Efficiency
Usually, the amount of useful energy after a conversion will be less than the original energy. In no case can it be more.Usually, the amount of useful energy after a conversion will be less than the original energy. In no case can it be more.Usually, the amount of useful energy after a conversion will be less than the original energy. In no case can it be more.Usually, the amount of useful energy after a conversion will be less than the original energy. In no case can it be more.
It stays constant
No. In heat energy, there is always a certain amount of unusable energy. What amount depends on the availability of colder objects.
friction
In any transfer of energy or conversion of energy from one form to another, the total amount of energy does not change. The total amount of usable energy, however, always decreases.
The formula E=mc2 states that the conversion ratio of mass to energy is "Energy=mass times the speed of light squared" (which indicates that the conversion of a small amount of mass can create a very large amount of energy).
Kinetic or potential energy are always present during energy transfers.
You can't convert that. A certain amount of fuel has a certain amount of energy; kilowatt is a unit of power, not of energy.
Any time there is an energy conversion, a certain amount of one type of energy gets reduced, and another type of energy increases. The amounts lost and gained are the same, so total energy is conserved.
Yes, some energy is always lost, in most conversions.Yes, some energy is always lost, in most conversions.Yes, some energy is always lost, in most conversions.Yes, some energy is always lost, in most conversions.
There are many energy efficient cells working in the energy conservation in a cow. These include sleeping an extra amount to digest food.