Potential Energy in Fuels: How Does a Fully Charged Battery Measure Up?

In summary, potential energy in fuels refers to the energy stored in the chemical bonds of a substance, which can be released through a chemical reaction. It is measured in units of energy and varies depending on the molecular structure and strength of the bonds. Fuels with high potential energy include gasoline, natural gas, coal, and propane, which are used to power various machines and processes. However, the burning of fuels has negative environmental impacts, such as air pollution and climate change, highlighting the need for responsible use and exploration of alternative, sustainable energy sources.
  • #1
aaronb
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Homework Statement


A fully charged 15.0 kg lead-acid battery can deliver power 1450 W for 1.0 hr. (For comparison, the "heat of combustion" of gasoline is about 44 MJ/kg.)

Battery _____ MJ/kg

Homework Equations


Unit conversion problem
1W = 1 J/s

The Attempt at a Solution


(1450 J/s / 15kg) = 96.7/10^6 = 9.6 *10^-5
 
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  • #2
How many Joules is 1450W times 1 hour ?
 
  • #3
MJ/kg

The potential energy in fuels, such as gasoline, is typically measured in units of energy per unit mass, often in MJ/kg. This value is a measure of the amount of energy that can be released from the fuel when it undergoes combustion. In comparison, the fully charged lead-acid battery mentioned in the homework statement has a potential energy of approximately 9.6 * 10^-5 MJ/kg. This highlights the significant difference in the amount of energy stored in fuels compared to batteries, and the importance of efficient energy storage and utilization in various systems. Further exploration and research into alternative energy sources and storage methods is crucial in addressing global energy needs and sustainability.
 

What is potential energy in fuels?

Potential energy in fuels is the energy that is stored in the chemical bonds of a substance. This energy can be released and converted into other forms, such as heat or kinetic energy, through a chemical reaction.

How is potential energy in fuels measured?

Potential energy in fuels is typically measured in units of energy, such as joules or calories. The amount of potential energy in a fuel depends on its molecular structure and the strength of its chemical bonds.

What are some examples of fuels with high potential energy?

Fuels that have high potential energy include gasoline, natural gas, coal, and propane. These substances have complex molecular structures and strong chemical bonds, making them efficient sources of energy.

How is potential energy in fuels used?

Potential energy in fuels is used to power various machines and processes. When the fuel is burned, the potential energy is converted into heat energy, which can then be used to generate electricity, propel vehicles, and heat buildings.

What are the environmental impacts of potential energy in fuels?

The burning of fuels releases carbon dioxide and other pollutants into the atmosphere, contributing to air pollution and climate change. The extraction and transportation of fuels can also have negative impacts on the environment. Therefore, it is important to use fuels responsibly and explore alternative, more sustainable sources of energy.

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