ENERGY. PLEASE PICK UP A COPY OF THE “ENERGY CONSUMPTION” WORKSHEET & READ!. WHAT IS ENERGY?. The ability to do work. FORMS OF ENERGY. Light Heat Electrical. Mechanical Sound Chemical. LAWS OF THERMODYNAMICS. 1 st Law:
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PLEASE PICK UP A COPY OF THE
“ENERGY CONSUMPTION” WORKSHEET & READ!
The ability to do work
Energy can be changed from one form to another, but cannot be created or destroyed
Energy tends to change from a more ordered to a less ordered form; in other words, entropy increases.
Entropy = the amount of energy not able to do work.
when energy changes from one form to another, we say that some of the energy is “lost”, but what we mean is that some of the energy is dissipated to the surrounding environment as heat.
When we use energy it is best to use it by changing its form as few times as possible.
In a rural village in China:
In the US:
Efficient energy consumption is difficult to determine if we don’t know how to measure energy consumption…
Measuring energy consumption requires the conversion of units commonly used to measure different forms of energy – see the “Energy Consumption” worksheet:
FOLLOW THE DIRECTIONS ON THE WORKSHEET – ASK IF YOU DO NOT KNOW HOW TO COMPLETE A STEP!
= 486.7 BTU / hr
How many gallons of oil could be saved in one year if one window was removed from this room?
How many gallons of oil could be saved in one year if one window was removed from each classroom in this building? (73 rooms)
18,396 lbs X 80 F = 1,471,680 BTUs
Watts is the energy used per hour
3. Work on your energy project – remember, it is due April 30!!!