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Input is electricity and output is sound, heat and light.
The energy input is always greater than energy output.
Input energy = output energy + losses
You divide useful output energy by the input energy. Or equivalently, useful output power by input power.
Efficiency = ( useful energy output / total energy input ) x 100
With energy input
the input isand the outpt is
Energy output refers to the amount of usable energy obtained from a system, while energy input is the amount of energy required to operate that system. A system is considered efficient when the energy output is greater than the energy input. Conversely, inefficiency occurs when more energy is put into a system than what is obtained as output.
The result (ratio) of such a comparison is called the efficiency. Note that total energy output must be equal to energy input (conservation of energy); however, what is relevant for this comparison is the useful energy output.
The total energy in the kettle system will be 2000J. However, the energy will be distributed different ways. Some will go into heating the water, some will go into changing the water into steam (which takes a LOT of energy), and some will be lost as radiant heat energy. The specifics depend on the kettle itself, and how much water you have in the kettle.Changing one milliliter of water by one degree requires 4.186 J of energy, but to convert it into steam requires 2259.36 J per ml
Microphones do not output anything, they are INPUT devices.
No.