Question

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Figure 2.6a shows that 8% of U.S. energy comes from nuclear power plants. The output of those plants is elec- tricity, and this nuclear-generated electricity represents 20% of U.S. electrical energy. Use these facts to deter. mine the fraction of the total U.S. energy supply that is in the form of electricity. 3。40% FIGURE 2.6 Sources of energy in the mid- 2010s, shown as percentages (a) Some 82% of U.S. energy comes from fossil fuels. The Other category includes geothermal, wind, and solar energy (b) Fossil fuels supply about 86% of the world's energy. Here the "Other category includes biomass, geothermal, wind, and solar energy Biomass 4.8%- Hydro 68%- Other 2.5% 厂Other 2.4% Hydro 2.5% Nuclear 44% 'Coal 18% /Coal 30% Nuclear 85% Gas 24% Gas 28% oil 33%

Answer 1

Fact 1: 8% of the Total US Energy comes from the nuclear power plants.

$\frac{Total\ US\ Energy\times 8}{100}=Nuclear\ Energy$

$Total\ US\ Energy=\frac{Nuclear\ Energy\times 100}{8}$

Fact 2: 20% of the Total US Electricity comes from the nuclear power plants.

$\frac{Total\ US\ Electricity\times 20}{100}=Nuclear\ Electricity$

$Total\ US\ Electricity=\frac{Nuclear\ Electricity\times 100}{20}$

Now,

The fraction of Total US Energy supply that is in the form of electricity.

$Fraction=\frac{Total\ US\ Electricity}{Total\ US\ Energy}\times 100\%$

$Fraction=\frac{100\times Nuclear\ Electricity\times 8}{20\times100\times Nuclear\ Energy}\times 100\%$

Nuclear Energy is Nuclear Electricity. So,

$Fraction=\frac{8}{20}\times 100\%=40\%$