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Understanding Electric Energy Measurement and Appliance Operating Costs

This guide provides a comprehensive overview of electric energy measurement, the units used, and how it affects your electric bill. It includes explanations on what electric energy is, how it's measured, and how to read your electric bill. Additionally, it covers the cost to operate common appliances, using formulas to calculate energy usage and expenses. Gain insights into key concepts such as voltage, current, resistance, and wattage. Learn to read appliance nameplates and determine the annual costs of running household devices.

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Understanding Electric Energy Measurement and Appliance Operating Costs

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  1. Electric Energy Measurement, Units, and cost Your Electric Bill Cost to Operate Appliances

  2. Topics Part 1: Your Electric Bill • What Electric Energy is • How Electricity is Measured • Reading your Electric Bill Part 2: Cost to Operate Appliances • Power – Energy - Cost • Reading Appliance name plates • Calculating the cost to operate appliances

  3. Voltage Current Resistance Load Power Energy Kilowatt Kilowatt - Hour Key Terms

  4. Part 1: Your Electric BillWhat is Electric Energy? • Energy helps us do many things. • Energy is defined as the ability to do work. • Electrical Energy is • Easily convertible to other forms • Easily moveable from one area to another • Not easily stored

  5. Units of Measure • Ohm’s Law: V=IR • Power Law: P=IV • Voltage • Current • Resistance • Time Rate of Energy Usage • Power • Watts = Joule/s • Energy Used • Kilowatt-hours

  6. How Electricity is Measured

  7. Read both sets of dials and calculate the usage per day.

  8. (41615 – 40565) / 5 = 1050 kWH / 5 days = 210 kWH/day

  9. Part 2: Cost to Operate AppliancesPower – Energy - Cost • Energy consumed: E = P tE =100 W bulb left on for 20 hours = 2 kWH • Cost to Operate: C = E RC = 2 kWH x $0.15 / kWH = $0.30

  10. Reading Appliance Nameplates

  11. Calculating the Cost to Operate an Appliance • Power consumed: P = I VA 120V appliance with 2 Amps of current uses 240 Watts of power. • Duty cycle: • The total number of hours that the appliance is on during a typical period of time (day, month, or year).2 hour/day = 2 x 365 = 739 hr/yr • It is sometimes shown as a percentage2 hour/day = 2 hour / 24 hours = 8%739 hour/yr = 739 / 8760 = 8% • Energy Consumed: E = P tE = 240 W x 2 Hr/day = 0.480 kWH/day • Cost to Operate: C = E RC = 0.480 kWH x $0.15/kWH = $0.072 each day • Annualized Cost$0.072 /day x 365 day/yr = $26 / yr

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