Bread and carbohydrates are the main sorce of energy
LEDs are the most energy-efficient lights as of 2016.
sugars
Wind energy is one of the most eco friendly energy source but is not as efficient as others
Depends on the source
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.
Carbohydrates are the body's preferred energy source because they are easily broken down into glucose, which fuels most of the body's cells and tissues. Proteins and fats can also be used for energy, but carbohydrates are the body's primary and most efficient source of fuel.
The most commonly used cooking energy source in Alberta is natural gas. It is widely available, efficient, and relatively inexpensive compared to other options.
The most efficient electric heat source available on the market today is a heat pump. Heat pumps can provide both heating and cooling, and they are more energy-efficient than traditional electric resistance heaters.
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It isn't, yet.
No. Nuclear energy is the most efficient in producing steam for use in engines. 15-20% of the energy in fossil fuels is lost up chimneys into the atmosphere, and is unusable. Solar and Wind energy farms cannot harness or convert effectively all the energy in the sunlight or wind and have much lower actual efficiencies. Fossil fuels presently are the cheapest and most reliable energy source available. Solar and wind energy are less reliable.