Depends on the source
LEDs are the most energy-efficient lights as of 2016.
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Bread and carbohydrates are the main sorce of energy
It isn't, yet.
sugars
Wind energy is one of the most eco friendly energy source but is not as efficient as others
Very little of the energy that goes to the electric fireplaces is wasted. However, as a heat source there are better, more efficient sources of heat.
ATP is a good source of energy for biological reactions because it can easily release and transfer energy when needed by breaking a phosphate bond, providing a quick and efficient source of energy for cellular processes.
Geothermal energy is considered more efficient and sustainable than solar power as it provides a consistent source of power without being dependent on weather conditions.
carbohydrates, which are broken down into glucose and provide a quick source of energy for the body. However, fat is the most energy-dense macronutrient and provides a longer-lasting source of energy. In the absence of carbohydrates, the body can also use protein as an energy source.
Not really because the intense gravity field prevents most of the energy escaping.
Glucose is the preferred source of energy for the human body because it is easily broken down and converted into energy, providing a quick and efficient fuel source for cells to function properly.