Energy Consumption Dr Farid Farahmand Cost of one

Energy Consumption Dr. Farid Farahmand

Cost of one KWatt-hour

How Much Energy Do we Use? Total Energy Consumption of the World in 2010: 15 x 10^12 Watts! = 15 TWatt Most of this comes form fossil fuel (coming from remain of plants and animals): • Oil • Coal • Gas CO 2 Emission Climate Change!

Energy Usage

U. S. household energy http: //michaelbluejay. com/electricity/howmuch. html

Power Consumption of Different Appliances

W-Hour Continuous Use

Alternative Sources of Energy

Where does energy come from?

Solar Power Sun provides abundance of energy that can be used for different applications: • Solar Heating • Solar Cooling • Solar Cooking • Solar Electricity

Converting Solar Energy to Electricity

The output current of this reaction is DC (direct) and the amount of energy produced is directly proportional to the amount of sunlight put in. l Cells only have an average efficiency of 8 -30% l

Waldpolenz Solar Park (East Germany) http: //www. dw-world. de/dw/article/0, 2144, 3430319, 00. html

How PV Systems Work

What DO You Build?

DEMO Solar Panels: Series or Parallel l Connecting PVs to the load l AC vs DC l IV-Curve of PVs l

How to Read Your Electric Bill http: //131. 89. 128. 67/myhome/myaccount/charges/ Calculating Your Footprint: How much greenhouse gas emissions such as carbon dioxide (CO 2) is generated to produce the required amount o of energy. http: //131. 89. 128. 67/myhome/environment/calculator/

Question l I'm trying to determine how many amps I'm putting on a circuit so I don't overload it, but I'm having a hard time understanding the labels. For instance, my DSL modem adapter says "INPUT: 120 V 60 Hz 30 W" and "OUTPUT: 12 VAC 1. 67 A" I understand how to convert watts to amps [Watts / Voltage = Amps], so it looks like in this case the input (30 watts or. 25 amps) is less than output (200. 4 watts or 1. 67 amps). What am I missing? l The output is 12 V x 1. 67 A = 20 W, which is less than the 30 W input. Output is always less than input, because the conversion process is inefficient.

Vampire power! l Things that use electricity even when they're off l How much standing power are you using? power strip with individual switches

References l http: //michaelbluejay. com/electricity/how much. html