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28 Cards in this Set
- Front
- Back
# of Joules in a BTU (Approx)
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1000 J/BTU (1055 exact)
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# of Joules in 1 Cal
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4200 J/Cal (4184)
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# of BTU in 1 Cal (approx)
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4 BTU/Cal (3.96)
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Energy in 1g of Gasoline
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"10Cal = 10Wh = 42,000J"
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Compare Energy per Gallon of Gasoline and Liquid Hydrogen
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Gasoline has 3x the energy per gallon compared to LH2
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# of Joules in 1kWh
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3.6E6 J/kWh
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Electric Motor Efficiency
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80-90%
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Gasoline Engine Efficiency (Work Done)
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20%
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Weight (lbs) and Mass (kg) of 1 Gallon of Gasoline
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6 lbs, 3 kg (approx)
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# of Cal in 1 Wh
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.86 Cal/Wh
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Is kWh Energy or Power?
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Energy
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# of Calories in Can of Coke
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150 Calories (approx)
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Compare Density of Liquid H2 and Gasoline
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Gasoline is 10x more dense than LH2
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What is the proper name for Cal
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Kilocalorie
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Compare the energy of 1g of gasoline to 1g oflLead-acid battery
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Gasoline has approx. 300 times the energy per g than lead-acid batteries
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# of Joules in 10^15 BTU
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10^18
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Speed of Light in ft/ns
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1 ft/ns
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Compare Energy Density of Liquid H2 and Gasoline
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LH2 has 3 times the energy per gram than gasoline.
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"If used in internal combustion, approximately how many kg of hydrogen equals 1 gallon of gasoline?"
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1
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What is the energy from sunshine per square meter in Ohio in one year (approx)?
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1MWh/m^3
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Dimensions of a US nickel
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5g; 20mm diameter (21.21 exact); 2mm thick (1.95 exact)
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What is a "Quad"
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1 quadrillion BTUs = 1E15 BTU
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# of Hours in a Year
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9E3 hrs/yr (8760 hrs/yr exact)
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# Minutes in a Year
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5E5 min/yr (525,600 in 365 days exact)
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# Seconds in a Year
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piE7 sec/yr (3.1536E7 exact)
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Average Rate of Worldwide Human Energy Consumption (Power)
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15TW (approx)
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Annual World Energy Consumption (2011)
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Approx. 500 EJ or 500 quads. This is 500E18J or 500E15 BTU
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What is the approximate % of energy used by humans that is derived from fossil fuels?
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80%
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