Energy and Enviro Final Review

Energy and Enviro Final Review - PHSC 51 QUIZ 1 Name Fig...

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PHSC 51 QUIZ 1 Name:______________________________ Fig 1.6 U.S. Total Yearly Energy Production and Consumption 1.(3 pts.) Briefly discuss the gap between the two curves in Fig. 1.6 above. What are the future implications?
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United States Production and Consumption
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2. (2 pts.) The electric power company bills you for the number of kWh that you use; however, kWh is NOT a power unit. What does kWh stand for and of what quantity is it a unit?
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Table 2.2(a). Some special energy units. Study Area Equivalent Other Special Unit of Main Use Symbol in Joules Units kilowatt-hour electricity kWh 3,600,000 3413 Btu calorie heat cal 4.186 kilocalorie (food calorie) heat kcal 4186 1000 cal British thermal unit heat Btu 1055
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3. (5 pts.) From 1941 to about 1971, electrical energy production in the U.S. doubled every 10 years. What was the approximate percentage growth rate per year? (Show Calculation.)
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Historical Electrical Energy Consumption 1973 - 2003 Rate of Growth = 3.5 % per Year Period Time per % 70% Time Doubling = Year / % 3.5 % 70 Time Doubling = Years 20 Time Doubling =
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PHSC 51 QUIZ 2 1. (4 pts.) The 1970 R/P ratio for oil was 10 years? That was 37 years ago. Why are we not out of oil?
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Reserve to Production Ratios Oil 11.7 9.6 10 Natural Gas 9.25 8.8 14 Coal 465 466 300 1997 1970 2003 (Years)
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2. (1 pts.) Why should you never open the back of a TV, even if it is off?
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Electron Accelerated in TV Picture Tube Cathode Anode
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TV Picture Tube
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3. (1 pts.) What does the bulb do in an ordinary (incandescent) light bulb?
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Incandescent Light Bulb
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4. (4 pts.) You have a 10 Ω and a 15 Ω resistor. What two values of equivalent resistance can you obtain by hooking them in series and in parallel? Series: ___________________ Parallel: __________________
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Resistors in Series 3 2 1 R R R R eq + + =
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Resistors in Parallel 3 2 1 1 1 1 1 R R R R eq + + =
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4. (4 pts.) You have a 10 Ω and a 15 Ω resistor. What two values of equivalent resistance can you obtain by hooking them in series and in parallel? Series: ___________________ Parallel: __________________ 25 Ω 6 Ω + = 15 1 10 1 1 eq R = + = 30 5 30 2 30 3 = = 6 5 30 eq R
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PHSC 51 QUIZ 3 1. (3 pts.) Fundamentally, how (why) does a generator work?
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INDUCTION
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