The answer to your question is called efficiency
That is called the "efficiency" of the device.
computer
The answer is efficiency.
Efficiency.
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Reducing energy use is called energy conservation and efficiency is the percentage of energy that is actually used to perform work the rest of energy that is '' lost '' to the surrondings.
Energy storage is accomplished by devices or physical media that store some form of energy to perform some useful operation at a later time. A device that stores energy is sometimes called an accumulator.
When you say 'Device', then this indicate some item or tool that has the ability to perform a job. When this device perform a job, no matter how small, there is a conversion of energy involved. In other words. Absolutely all devices convert energy of some sort. Even a tiny pebble falling 1 inch does convert some energy, however small.
The percentage of energy converted into useful work is called the EFFICIENCY.
That is called a generator, or a dynamo.
Such a device is called a generator, or a dynamo.
Nonconductor