491 Mental Pegs

Front 1

# of Joules in a BTU (Approx)

Back 1

1000 J/BTU (1055 exact)

Front 2

# of Joules in 1 Cal

Back 2

4200 J/Cal (4184)

Front 3

# of BTU in 1 Cal (approx)

Back 3

4 BTU/Cal (3.96)

Front 4

Energy in 1g of Gasoline

Back 4

"10Cal = 10Wh = 42,000J"

Front 5

Compare Energy per Gallon of Gasoline and Liquid Hydrogen

Back 5

Gasoline has 3x the energy per gallon compared to LH2

Front 6

# of Joules in 1kWh

Back 6

3.6E6 J/kWh

Front 7

Electric Motor Efficiency

Back 7

80-90%

Front 8

Gasoline Engine Efficiency (Work Done)

Back 8

20%

Front 9

Weight (lbs) and Mass (kg) of 1 Gallon of Gasoline

Back 9

6 lbs, 3 kg (approx)

Front 10

# of Cal in 1 Wh

Back 10

.86 Cal/Wh

Front 11

Is kWh Energy or Power?

Back 11

Energy

Front 12

# of Calories in Can of Coke

Back 12

150 Calories (approx)

Front 13

Compare Density of Liquid H2 and Gasoline

Back 13

Gasoline is 10x more dense than LH2

Front 14

What is the proper name for Cal

Back 14

Kilocalorie

Front 15

Compare the energy of 1g of gasoline to 1g oflLead-acid battery

Back 15

Gasoline has approx. 300 times the energy per g than lead-acid batteries

Front 16

# of Joules in 10^15 BTU

Back 16

10^18

Front 17

Speed of Light in ft/ns

Back 17

1 ft/ns

Front 18

Compare Energy Density of Liquid H2 and Gasoline

Back 18

LH2 has 3 times the energy per gram than gasoline.

Front 19

"If used in internal combustion, approximately how many kg of hydrogen equals 1 gallon of gasoline?"

Back 19

1

Front 20

What is the energy from sunshine per square meter in Ohio in one year (approx)?

Back 20

1MWh/m^3

Front 21

Dimensions of a US nickel

Back 21

5g; 20mm diameter (21.21 exact); 2mm thick (1.95 exact)

Front 22

What is a "Quad"

Back 22

1 quadrillion BTUs = 1E15 BTU

Front 23

# of Hours in a Year

Back 23

9E3 hrs/yr (8760 hrs/yr exact)

Front 24

# Minutes in a Year

Back 24

5E5 min/yr (525,600 in 365 days exact)

Front 25

# Seconds in a Year

Back 25

piE7 sec/yr (3.1536E7 exact)

Front 26

Average Rate of Worldwide Human Energy Consumption (Power)

Back 26

15TW (approx)

Front 27

Annual World Energy Consumption (2011)

Back 27

Approx. 500 EJ or 500 quads. This is 500E18J or 500E15 BTU

Front 28

What is the approximate % of energy used by humans that is derived from fossil fuels?

Back 28

80%