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Power is the amount of work(W) done in a given amount of time(t).
Efficiency is a measure of how a machine is effective. This is done by taking the ratio of output work and dividing by the work input
e=Work/WI*100
Answer
Efficiency is the ratio of a machine's output power to its input power, usually expressed as a percentage.
A machine will always have losses, so its efficiency will always be less than 100%.
Further to the original answer, 'effectiveness' and 'efficiency' are two completely-different concepts. Effectiveness (or 'efficacy') defines whether or not a device achieves what it is designed to achieve; efficiency provides a way of defining the losses that occur while the device achieves what it is designed to achieve. For example, a motor might be perfectly 'effective' at producing rotatary movement, but it loses 5% of its input power doing so. So it is 100% effective but only 95% efficient,
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What is the formula of efficiency?
The formula of efficiency is power output divided by the power input.
How is a machine's efficiency of a calculated?
Efficiency = useful output power / input power
How can a machine's efficiency be calculated?
You use the definition of "efficiency": you divide output power by input power. Both of these, of course, need to be measured or calculated.
What must you know in order to calculate a machine's efficiency?
The efficiency tells you how good the machine is. Efficiency equals the power output of the machine divided by the power that is input via a shaft, or via electrical wires, or via fuel. So if the machine has a low efficiency it wastes power and energy, which costs money. The average ordinary automobile has an efficiency of 20-25%. A lot of research work goes into improving that figure.
What is the efficiency of hydro power plant?
It is around 35 to 40 %
Efficiency is a comparison of?
Efficiency is output power divide by input power.
How is the efficiency of a machine calculated?
Efficiency = useful output power / input power
What is the formula to efficiency?
Efficiency = (output power/input power) x 100%
What is the formula of efficiency?
The formula of efficiency is power output divided by the power input.
How is a machine's efficiency of a calculated?
Efficiency = useful output power / input power
The ratio of output power to input power in percent is called a conductivity b efficiency c work d horsepower?
B.) efficiency
What is efficiency and how is it calculated?
The efficiency is output divided by input.
What are high efficiency motors?
The efficiency of a motor is the output power divided by the input power. The difference is the lost power which appears as heat usually. High-efficiency motors produce very little lost power. But they tend to be more massive and expensive to make, so that most motor designs have to compromise on efficiency.
Why is a high efficiency machine is more desirable than a low efficiency machine?
A high efficiency machine will produce more of what is it that you want with the same power as the low efficiency one. In other words, for a low efficiency machine do as much as a high efficiency one, you have to give it more power (energy).
What is inverter efficiency?
Inverter efficiency varies with DC input voltage, ambient temperature, and operating power level of the inverter. It can mean power-out divided by power-in.
What do you understand by efficiency of motor or generator?
The efficiency of any machine is the output power divided by the input power, usually expressed as a percentage.
If the power input to a machin 75w and the output is 50w the efficiency is?
Generally efficiency is the ratio of the energy or power utilized usefully to the energy or power given as input to the device. So efficiency in this case = 50/75 = 2/3 Usually efficiency will be given in percentage. So multiplying 2/3 by 100 we get 66.7% as the efficiency of the machine.
