Efficiency

Posted by Sek | 3:07 AM | | 12 comments »

Efficiency

The efficiency of a device is defined as the percentage of the energy input that is transformed into useful energy.

Example
In the example above, the input power is 100J/s, the desire output power (useful energy) is only 75J/s, the remaining power is lost as undisire output. Therefore, the efficiency of this machine is

75/100 x 100% = 75%

Air Conditioner

  1. Switch off the air conditioner when not in use.
  2. Buy the air conditioner with suitable capacity according to the room size.
  3. Close all the doors and windows of the room to avoid the cool air in the room from flowing out.
Refrigerator
  1. Always remember to close the door of refrigerator.
  2. Open the refrigerator only when necessarily.
  3. Always keep the cooling coil clean.
  4. Defrost the refrigerator regularly.
  5. Choose the refrigerator with capacity suitable for the family size.
  6. Refrigerator of large capacity is more efficient compare with refirgerator of small capacity.
Lamp or Light Bulb
  1. Use fluorecent bulb rather than incandescent bulb. Fluorescent bulbs are much more efficient than incandescent bulbs.
  2. Use a lamp with reflector so that more light is directed towards thr desirable place.
Washing Machine
  1. Use front-loading washing machine rather than top-loading wahing machine because it uses less water and electricity.
  2. Use washing machine only when you have sufficient clothes to be washed. Try to avoid washing small amount of clothes.


External Link


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