energy transfers

• The AMOUNT OF ENERGY an appliance transfers depends on two things:

  • How long the appliance is on (time)
  • The power rating of the appliance

  
• Everyday electrical appliances are designed to bring about ENERGY TRANSFERS.

  • Appliances transfer energy ELECTRICALLY from either BATTERIES (if it’s battery powered) or the AC MAINS (if it needs to be plugged in).
• Vacuum cleaner transfer energy electrically from ac mains to kinetic energy in the electric motor.
• WORK IS DONE when charge flows through a circuit
• POWER RATINGs

  • On every electrical appliance, it tells you how much energy it needs to work.
  • It's possible to describe the POWER RATINGS & how they relate to changes in stored energy.
• A high-power appliance like a toaster uses more energy in a shorter amount of time compared to a low-power appliance like a clock.