What does effiecienty mean in science?

Answer 1

Efficiency=Useful energy output divided by the energy input. i.e. 100 J is the energy input and you get 5 J light energy from a lamp, the waste energy would be 5 J.

Answer 2

Is the goal of efforts to reduce the amount of energy required to provide products and services.

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Answer 3

Energy conversion efficiency is the ratio between the useful output of an energy conversion machine and the input, in energy terms. The useful output may be electric power, mechanical work, or heat.

Answer 4

Fuel is a substance that is used in engines. The motor generates a chemical reaction in the fuel (generally fuel molecules breaking is generated by increasing the fuel temperature and pressure). During the reaction the chemical energy stored in the molecular bonds of the fuel is released, generally in form of heat, and it is used to generate mechanical motion of the engine parts.

The ratio between the total heat that the engine is able to exploit (Q) and the total energy stored in the broken bonds (Echem) is called fuel efficiency (ef). Thus

ef=Q/Echem

The ratio between the mechanical energy produced by the engine (Emec) and the used heat (Q) is called instead engine efficiency (ee). Thus

ee=Emec/Q

The total efficiency of the process (that is the ratio between the chemical energy and the produced mechanical energy) (etot) is given as usual by the product of the efficiencies of the different process parts. Thus

etot=Emec/Echem=Emec/Q X Q/Echem=ef X ee

Answer 5

In mechanics, the term efficiency is the measure of the effectiveness with which a system performs.It is also stated as the ratio of a system's work output to its work input.

For example, the efficiency of a real system is always less than 1 because of friction between moving parts. A machine with an efficiency of 0.8 returns 80% of the work input as work output; the remaining 20% is used to overcome friction.

In a theoretically frictionless, or ideal, machine, the work input and work output are equal, and the efficiency would be 1, or 100%.

Answer 6

This is a measure of how much energy that is produced is made into a type of energy that can be used. For example, a car produces kinetic energy to move itself, which is useful. Unfortunately, some of the energy produced is turned into heat energy because of the friction of the tires against the ground. We cannot use this energy, and so it is "wasted". If an object produced 100 joules of energy, and 80 joules were in a usable form, then the object would be 80% efficient. We're striving to create something that is 100% efficient, but this may be impossible.

Answer 7

It refers to the amount of energy being used by an appliance for its specific purpose. For example with light bulbs, a higher energy efficient one will transfer a higher percentage of the energy put into it into light energy as opposed to heat energy. Whereas a lower efficiency one will transfer a higher proportion of energy into heat compared to the high efficiency one.

So a higher energy efficient bulb will use less energy to put out the same amount of light as a lower energy efficient one.

Answer 8

the percentage of energy used to total input energy

Answer 9

Energy efficiency is the amount of energy you get from a system.

Answer 10

It means that you make an effort to waste less energy.