Efficiency

• What should you be able to calculate by the end of the video?

  Efficiency of energy transfer
• What does efficiency tell us about energy transfer?

  It tells us what fraction of the energy put into an appliance is transferred to useful forms of energy.
• What are the two types of light bulbs mentioned?

  • Incandescent bulb
  • LED bulb
• What is the formula for calculating efficiency?

  Efficiency = useful output energy transfer / total input energy transfer
• What is another formula for calculating efficiency?

  Efficiency = useful power output / total power input
• Why is it important to learn the efficiency equations?

  Because they are not given in the exam.