Fermi Formulas and Anchors - Chemical & Electrical Energy

power used in old fashioned lightbulbs

10² W

gasoline chemical sign

CH₂

methane chemical sign

CH₄

Carbon weight per mol

12 g/mol

Hydrogen weight per mol

1 g/mol

oxygen weight per mol

16 g/mol

eV per CO₂ or H₂O

1.5 eV

1 eV is equal to

2×10^-19 J

avogadro’s #

6×10²³ moler/mol

how many watts are in a lightbulb

5W

1 Cal is equal to

4×10³ J

energy density of a battery

8×10⁵ J/kg

energy density of gasoline

4×10⁷ J/kg

how many miles does a car go in a year?

10,000 miles/year

mass of tank of gasoline

50 kg

mass of a car

2×10² kg

how many GJ does it take to power car?

80 GJ

how many GJ does it take to power 1 person?

3 GJ

1J is equal to

1 W (1s)

electric energy unit

kWhr

how many cents per kWhr?

10 cents

how many circuit breakers in a home?

20 cb

W in a space heater? (aka avg power in a house)

1500 W

electrical power used in an avg American household

4×10⁴ W

how much energy does an american family use

1.5 kW

radius of earth

6.4×10⁶ m

seconds per year

3×10⁷ s

energy from the sun reaching the earth (S_o)

1,400 w/m²