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# 1.electrical systems appliances

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### 1.electrical systems appliances

1. 1. Electrical Systems Appliances
2. 2. Time OApproximately 90 min
3. 3. Prepare
4. 4. 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.
5. 5. 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
6. 6. 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
7. 7. 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.
8. 8. 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)
9. 9. 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
10. 10. 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.
11. 11. 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?
12. 12. 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