1.electrical systems appliances
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Transcript of 1.electrical systems appliances
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Electrical Systems Appliances
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Time
OApproximately 90 min
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Prepare
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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.
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Objectives OStudents will be able to correctly
measure the energy consumption of various appliances by using a Kill-A-Watt meter
OStudents will be able to calculate an estimated annual energy cost for common appliances
OStudents will be able to correctly differentiate between energy and power
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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
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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.
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Crosscutting ConceptsO 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)
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Materials OKill-A-Watt meters ( one per group of 3-4
students OActivity worksheets OCalculators OAt least 5 various classroom and home
appliances for the students to measure OArrange the appliances in stations
around the classroom
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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 ÷ 1000O Phantom load – the electrical power consumed an
appliance when it is switched off or in standby mode; sometimes called vampire load.
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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?
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Appliance Watts Hours / day
Days / week
Weeks / year
Annual watt-hours
Annual kilowatt-hours (kWh)
1. On
Off
2. On
Off
3. On
Off
4. On
off
5. On
Off