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ENERGY USAGE

ENERGY USAGE. ENERGY USAGE. Energy and Electricity Student Assignment Sheet.

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ENERGY USAGE

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  1. ENERGY USAGE

  2. ENERGY USAGE Energy and Electricity Student Assignment Sheet Electricity is a basic source of energy available to most people in America. For this project you will examine six appliances, machines, and tools in your home to see how much electricity they use and how much it costs to operate them. This activity should provide some insight into the importance of electricity in your life and into the mathematics involved in making calculations about electricity consumption and cost

  3. ENERGY USAGE terms Ampere: The unit of measurement of electrical current produced in a circuit by 1 volt acting through a resistance of 1 ohm. Volt (V): Measurement of electric potential or electromotive force Voltage:  The difference in electrical potential between any two conductors or between a conductor and ground. It is a measure of the electric energy per electron that electrons can acquire and/or give up as they move between the two conductors.

  4. ENERGY USAGE terms Watt: The electrical unit of power. The rate of energy transfer equivalent to 1 ampere flowing under a pressure of 1 volt at unity power factor. Watthour (Wh): An electrical energy unit of measure equal to 1 watt of power supplied to, or taken from, an electric circuit steadily for 1 hour. Kilowatt (kW): One thousand watts. Kilowatthour (kWh): One thousand watthours.

  5. ENERGY USAGE terms Wattage You can usually find the wattage of most appliances stamped on the bottom or back of the appliance, or on its nameplate. The wattage listed is the maximum power drawn by the appliance. Since many appliances have a range of settings (for example, the volume on a radio), the actual amount of power consumed depends on the setting used at any one time. Refrigerator data plate

  6. ENERGY USAGE TERMS Electrical power ratings These are always shown on an electrical device along with voltage and frequency requirements.

  7. ENERGY USAGE ASSIGNMENT Electric companies charge for the number of kilowatt-hours used during a set period of time, often a month. One Power is measured in watts (voltage x current) Consumption is measured in kilowatt-hours

  8. ENERGY USAGE ASSIGNMENT Voltage (volts) P = VI Current (amps) Power (watts) Power (watts) = 120V x 8.75I = 1050W

  9. ENERGY USAGE ASSIGNMENT On the energy and electricity Data Sheetrecord the information for volts and amps. Use the formula P = VI to find watts. An appliance example is done for you on the data sheet handout

  10. ENERGY USAGE ASSIGNMENT • Now calculate and record for each item: • Watt-hours per day • Watt-hours per year • Kilowatt-hours per year • Cost per year for the electricity used (you will need to find out how much one kilowatt of electricity costs from your electric bill). • On a separate math worksheet show all the calculations for your data sheet entries in an orderly way. The answers should be labeled with units.

  11. ENERGY USAGE ASSIGNMENT The following list gives you the average wattage rating for common household equipment. For specific information on your home equipment, check the manufacturer's listing found in your owner's manual or on the information plate of the equipment.All wattages are approximate. See your equipment documentation for exact wattage.

  12. REFERENCES: “Electricity Terms and Definitions” US Energy Information Administration http://www.eia.doe.gov/electricity/page/prim2/charts.html#define “Energy and Electricity” teachervision.com “Estimating Appliance and Home Electronic Energy Use” U.S. Department of Energy http://www.energysavers.gov/your_home/appliances/index.cfm/mytopic=10040 “Appliances, How many appliances can a particular circuit handle?” Georgia Power website http://www.georgiapower.com/safety/chart.asp (2006) Horton, William. E-Learning by Design. Pfeiffer & Company,

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