What is energy efficiency & what is its SIGNIFICANCE??

Answer 1

The real answer is a little more complicated than what the previous two said, but not by much. Energy efficiency is actually a percentage calculation, which tells you how much energy you obtain from a process in relation to the amount of energy you put in.

For example, if you are doing some sort of mechanical or electrical engineering, you must recognize that each procedure will involve some energy. This concept is easy to see in the oil industry -- a company drills for oil (which takes energy -- money, human power, equipment, etc.) and needs to refine it (more energy). However, when the refined oil is mixed to form gasoline and it is burned in a combustion engine, energy is given back to the consumer.

If this doesn't make sense, search the web for other examples. Here's an easy equation to measure efficiency.

Efficiency= (Power Out) / (Power In)

The value should always be between zero and one... unless of course you've found the key to all our energy needs!

Answer 2

Efficiency of anything is a measure of how much use we get out of how much we put in. Typically efficiency is measured as a percentage of input. So if energy efficiency is what you are looking for efficiency = O/I X 100%; where O is the output energy and I is the input energy. We multiply by 100% to convert the O/I ratio to a percentage answer.

Energy is by definition the ability to do work or cause a change. So if we invest in getting some work done by putting energy into a system, we'd like to get as much work out of that system as possible given the energy we put into it. Thus, the significance of efficiency is that higher efficiencies yield higher returns on the investment. For example, all things equal, a motor with 60% efficiency will get more work done than a motor with 30% efficiency for the same amount of energy input.

Answer 3

Energy efficiency is all how much energy you use with anything electronic, or powered by some dispensable fuel. the higher the efficiency, the less fuel/energy is consumed.

Answer 4

energy eff. is measurment oru can say a % performance given by a enrgy consuming device.

eg, if a car designedto run 20km per litre but now running at 10 km per lt,it means its engineefficiency is 50%, OR
e.g, a car run 15km in a litre of diesel. another car of same model run 10 km per litre, that means car 1 engine is 50% more efficient than car 2 engine.

Answer 5

while in theory efficiency would go from 0-100% the laws of thermodynamics would dictate that you can not ever get 100%

Answer 6

Is heat wasted energy? Personally, I like it.

Answer 7

using less electricity. You save money.