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sustenergy said 1 month Edit Delete
Is efficiency always a percentage? Couldn't we see mpg, kWh/m2 or lumens/Watt as measures of efficiency?
8efficiency
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Slideshow Transcript
- Slide 1: Output Efficiency = ------------ x 100 Always as a percentage Input
- Slide 2:An electric drive motor takes 48kW from the supply and delivers 42kW out of a gearbox into the load. What is the efficiency of the machine ? 48kW = input power 42kW = output power 42000/48000 x 100 = 87.5% efficiency
- Slide 3:If a similar machine took 56kW from the supply and delivered energy to the load at 85% , what is the output of the unit ? output power/ input power x 100 = efficiency output power = efficiency x input power/100 output power = 85 x 56000/100 = 47600W or 47.6 kW
- Slide 4: Formula Force = ma Newtons Work = F.l joules Power = Work / time Watts Torque = F r newton-metres Torque = Power x 60 /2 x π x N Potential energ
