Sun Power

Class III

Solar Ovens!

Review of previous class:

New Material

Applications Energy Power
electricity for houses watt = Joule/second

kilowatt-hour (kwh) = 3.6 million Joules = 3,413 Btu

 

kilowatts (kw)

1 Ton = 12,000 Btu/hr

Heating water British Thermal Unit (Btu) = 1055 Joules = raise 1 lb of water 1 degree fahrenheit

 

Therms/hr

watts

Heating  houses  

Therm = 100,000 Btus

1MMBtu = 1 million Btus (10 therms)

1 gallon propane = 91,200 Btu

1 cubic foot natural gas = 1020 Btu

Therms/hr
Powering vehicles gallon of gasoline ~ 34 kwh 1 horsepower = 746 watts
Output of utility scale wind turbines megawatt-hour (mwh) megawatts (Mw)
Output of power plants 1 kg coal = 30 MegaJoules Gigawatts (Gw)
Powering the human body calorie = 4.184 Joules; heats one gram of water one degree celsius; dietary calorie is 1000 calories dietary calories per day