1.electrical systems appliances
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1.electrical systems appliances

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1.electrical systems appliances 1.electrical systems appliances Presentation Transcript

  • Electrical Systems Appliances
  • Time OApproximately 90 min
  • Prepare
  • Overview O In this lesson, students determine the financial and environmental cost of some common appliances by measuring their energy consumption with a watt meter. Then, the cost effectiveness of a new refrigerator purchased is evaluated through payback calculations.
  • Objectives O Students will be able to correctly measure the energy consumption of various appliances by using a Kill-A-Watt meter O Students will be able to calculate an estimated annual energy cost for common appliances O Students will be able to correctly differentiate between energy and power
  • Standards Addressed O P.12.C.2- students know energy forms can be converted O P.12.C.6 – students know electricity is transferred from generating sources for consumption and practical uses O N.12.B.2 – students will know consumption patterns , conservation efforts and cultural or social practices in countries have varying environmental impacts
  • Next Generation Standards O HS-PS3-1: Create a computational model to calculate the change in the energy of one component in a system when the change in energy of the other component(s) and energy flows in and out of the system are known. O HS-PS3-3: Design, build, and refine a device that works within given constraints to convert one form of energy into another form of energy. O HS-PS3-5. Develop and use a model of two objects interacting through electric or magnetic fields to illustrate the forces between objects and the changes in energy of the objects due to the interaction.
  • Crosscutting Concepts O Energy and Matter: Changes of energy and matter in a system can be described in terms of energy and matter flows into, out of, and within that system. (HS-PS3-3)
  • Materials O Kill-A-Watt meters ( one per group of 3-4 students O Activity worksheets O Calculators O At least 5 various classroom and home appliances for the students to measure O Arrange the appliances in stations around the classroom
  • Vocabulary O Energy - a measureable quantity of work; energy= power × time O Power – the rate at which energy is used ; power= energy ÷ time O Watt – energy unit equivalent to the power you need to lift 100g. (a small apple) a distance of 1 meter in 1 second O Watt-hours- a measure of energy usage; watts × hours of use O Kilowatts –hours - watt ÷ 1000 O Phantom load – the electrical power consumed an appliance when it is switched off or in standby mode; sometimes called vampire load.
  • Questions 1. What is the difference between energy and power ? 2. List three appliances that you think may have a phantom load and give your reasoning? 3. Explain how appliances usage impacts the environment?
  • Appliance Watts Hours / day Days / week Weeks / year Annu al watt- hours Annua l kilowa tt- hours (kWh) 1. On Off 2. On Off 3. On Off 4. On off 5. On Off