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Chapter 14: Problem 4

Electricity is a secondary energy source. How is it generated, and how efficient is its generation?

Short Answer

Expert verified
Electricity is often generated through electromagnetic induction, which can be driven by burning fuels, harnessing wind energy, or using the potential energy in dammed water. The efficiency of this generation is dependent on how much useful energy is obtained from the total energy input and varies depending on the source of energy used, with renewable sources generally being more energy-efficient than non-renewable ones.

Step by step solution

01

Understanding Electricity Generation

Electricity is often generated through a process known as electromagnetic induction. This is obtained by the mechanical movement of conductors within a magnetic field. This movement can be generated in several ways, including burning fuels to produce steam, harnessing wind energy with turbines, or using the potential energy in dammed water to drive turbines.
02

Describe the Different Generation Methods

There are several methods to generate electricity. These include fossil fuels such as coal, natural gas, oil, renewable energy sources such as wind energy, solar power, tidal, geothermal and finally nuclear energy. Each method has its own efficiency and environmental impact.
03

Understanding Generation Efficiency

The efficiency of electricity generation is determined by evaluating how much useful energy is obtained from the total energy input. It's important to note that no generation process is 100% efficient, as there are always energy losses due to factors like heat and sound dissipation. Fossil fuel power plants typically operate at about 30-50% efficiency, nuclear power plants can reach up to about 35% efficiency, while renewable energy sources vary greatly based on type and location but are generally considered to be more energy-efficient than their non-renewable counterparts.

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