Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

This is an AMP page - Open full page! for all features.

Efficiency

Usefulnes of a process

Sponsored Links

Efficiency is the measure of "usefulness" of an operation, process or machine - and can be expressed on the generic form

μ = Wo / Wi    (1)

where

μ = efficiency

Wo = output from the operation - can be work, power, produced products ... 

Wi = input to the operation - can work, power, input products ...

Efficiency can be expressed as a percentage or as a per-unit decimal fraction of 1.

Example - Efficiency of an Electric Motor

The input power to an electric motor is 2000 W. The output power to the shaft is 1800 W. The efficiency of the motor can be calculated as

μ = (1800 W) / (2000 W)

  = 0.9

  = 90%

Example - Efficiency of a Wind Mill

The teoretical energy potential for a wind mill is 300 kWh at given conditions. The power produced is 70 kWh. The efficiency of the wind mill can be calculated as

μ = (70 kWh) / (300 kWh)

  = 0.23

  = 23%

Sponsored Links

Related Topics

Related Documents

Sponsored Links

Share

Search Engineering ToolBox

  • the most efficient way to navigate the Engineering ToolBox!

SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!

Privacy

We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.

Topics

Unit Converters

Temperature

oC
oF


Load Calculator!

Length

m
km
in
ft
yards
miles
naut miles


Load Calculator!

Area

m2
km2
in2
ft2
miles2
acres


Load Calculator!

Volume

m3
liters
in3
ft3
us gal


Load Calculator!

Weight

kgf
N
lbf


Load Calculator!

Velocity

m/s
km/h
ft/min
ft/s
mph
knots


Load Calculator!

Pressure

Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O


Load Calculator!

Flow

m3/s
m3/h
US gpm
cfm


Load Calculator!

9 13

This website use cookies. By continuing to browse you are agreeing to our use of cookies! Learn more