Electricity Units Pt. 2  BTU = a standard unit of measurement to denote the amount of heat energy in fuels.  A BTU is the amount of heat requirement.

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Presentation transcript:

Electricity Units Pt. 2  BTU = a standard unit of measurement to denote the amount of heat energy in fuels.  A BTU is the amount of heat requirement to increase 1 pound of water by one degree Fahrenheit

Electricity Units Pt. 2  According to some data, the average U.S. citizen uses million BTU per person, per year  Per capita = per person, individual

Electricity Units Pt. 2  In order to compare our data we need to calculate the per capita kWh use in our homes per year  Then find the class average and convert to millions of BTU ( MMBtu)

 If the average person uses million BTU per person, per year, how many kWh does that person use?  1 MMBtu = kWh  Spend some time and go over questions 1-4 on the “Home Energy Audit” worksheet

 Convert the annual per capita energy use in the U.S. (in 2011) to kWh and choose two more countries to compare  You must convert the data from MMBtu to kWh  Is the class below average or above average?

Consumption per person per state  The Average BTU used per person in Iowa per year is 472,000,000 in 2009  1 kWh = BTU  Lets look at problem #7

Estimating your Home Energy Use Heating: 26,500 WattsFurnace, 2000 sf, cold 7941 WattsFurnace, 1000 sf, warm 1440 WattsSpace Heater, High 900 WattsSpace Heater, Medium 600 WattsSpace Heater, Low 750 WattsGas Furnace

Estimating your Home Energy Use Cooling: 3500 WattsCentral air, 2.5 tons 1440 WattsWindow unit, Huge 900 WattsWindow unit, small WattsFan only