Question: When considering the energy supply for an automobile, the energy per unit mass of the energy source is an important parameter. Using the following data,

When considering the energy supply for an automobile, the energy per unit mass of the energy source is an important parameter. Using the following data, compare the energy per unit mass (J/kg) for gasoline, lead–acid batteries, and capacitors. (The ampere A will be introduced in the next chapter as the SI unit of electric current. 1 A = 1 C/s.)Gasoline: 126 000 Btu/gal; density = 670 kg/m3. Lead–acid battery: 12.0 V; 100 A+ h; mass = 16.0 kg. Capacitor: potential difference at full charge = 12.0 V; capacitance = 0.100 F; mass = 0.100 kg.

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