efficiency

• what is efficiency?

  measure of how much of total input energy is transferred to useful output energy
• formula for efficiency:

  efficiency = useful energy OUT / total energy IN (x100%)
• unit for efficiency?

  no unit
• how is efficiency expressed?

  in percentage or decimal
• one way to increase the efficiency of a moving machine:

  use lubricant to decrease friction
• the greater the amount of energy converted to useful energy, the more efficient it is.
• drawing efficiency

  the thickness of each arrow is drawn of scale to show the amount of energy