Beatrice Lang
Electricity is a set of physical phenomena associated with the presence and motion of matter possessing an electric charge. It is a fundamental concept in physics and has been known to humans in some form for thousands of years. From ancient Egyptian texts describing electric fish as the protectors of all other fish, to modern-day electronics, electricity has played a crucial role in the advancement of human civilization. But what is the scientific evidence for its existence? Is there statistically convincing data that supports the theory of electricity and its effects on our world?
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What You'll Learn
Neurodegenerative disease in electricity supply workers
Previous research has indicated a potential link between neurodegenerative diseases and exposure to extremely low-frequency electric and magnetic fields. This has raised concerns about the health of electricity supply workers, who are routinely exposed to such fields.
A 2014 study investigated whether there was a heightened risk of mortality from neurodegenerative diseases, specifically Alzheimer's, motor neurone, and Parkinson's, among UK electricity generation and transmission workers. The study examined the mortality data of 73,051 employees of the former Central Electricity Generating Board of England and Wales over a 37-year period, from 1973 to 2010. The results showed that deaths from Alzheimer's and motor neuron diseases were unexceptional, and while there was a slight excess of deaths from Parkinson's disease, it was not deemed statistically significant. The study concluded that there was no convincing evidence to suggest that electricity supply workers in the UK faced increased risks of neurodegenerative diseases due to their exposure to magnetic fields.
Similarly, an analysis of US mortality data among electrical utility workers also explored the potential link between neurodegenerative diseases and magnetic field exposure. This study, published in 1998, further reinforced the conclusion that occupational exposure to magnetic fields did not lead to increased mortality from neurodegenerative diseases.
While these studies provide some insight into the relationship between magnetic field exposure and neurodegenerative diseases, further research is needed to comprehensively understand the potential risks associated with occupational exposures.
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Electricity access and poverty alleviation
Electricity is crucial for poverty alleviation, economic growth, and improved living standards. The International Energy Agency (IEA) defines 'access to electricity' as involving more than just electricity delivery to a household. It also includes a requirement for households to consume a minimum amount of electricity, which differs based on whether the household is in a rural or urban area, and this threshold increases over time. The minimum threshold is set lower for rural households and higher for urban households.
Since 2000, access to electricity has increased dramatically across the globe, jumping from 75% of the global population to 90% by 2020. However, having access does not always translate to meaningful benefits for those with newly gained connections. For instance, the electricity supply may be unreliable or too costly to use. In fact, there are 1.18 billion people who live in areas so dark that they provide no statistical evidence of electricity usage from space, indicating a lack of electricity access or usage. This is despite the fact that official records show electrification in these areas. This could be due to frequent power outages, equipment malfunctions, or gaps in the distribution network.
The consequences of energy poverty are severe, including serious harm to physical health and mental well-being, social exclusion, stigmatization, and the impairment of social, political, and economic opportunities. Energy poverty is particularly prevalent in Sub-Saharan Africa, where most of the variation in energy poverty rates is explained by within-country differences in population density, remoteness, and land terrain characteristics.
To accelerate efforts to reduce energy poverty, settlement-level data on estimated electricity access and usage for 115 countries from 2013 to 2020 has been released. This data is part of the High Resolution Electricity Access (HREA) project, a partnership between the University of Michigan, the World Bank, the United Nations Development Programme, and the National Oceanic and Atmospheric Administration. The data reveals that many pockets of energy poverty lie right next to areas with established electrical networks, suggesting local opportunities to reduce energy poverty.
There are several ways to alleviate energy poverty, including improving electricity access for poor households, transitioning to low-carbon energy, and utilizing off-grid solutions such as solar-charged lanterns and small-scale solar home systems. These off-grid solutions can be more affordable than traditional approaches and can provide electricity for improved lighting, access to media, and limited use of appliances.
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Electricity generation and carbon emissions
Electricity generation is a major contributor to carbon emissions. Over 40% of energy-related carbon dioxide (CO2) emissions are due to the burning of fossil fuels for electricity generation. Worldwide emissions of CO2 from burning fossil fuels total about 34 billion tonnes per year, with coal, oil, and gas accounting for 45%, 35%, and 20% respectively. In 2023, utility-scale electric power plants burning fossil fuels were responsible for about 60% of total annual US electricity generation but a staggering 99% of associated CO2 emissions.
The electricity power sector involves the generation, transmission, and distribution of electricity. Carbon dioxide (CO2) constitutes the majority of greenhouse gas emissions from this sector, with smaller amounts of methane (CH4) and nitrous oxide (N2O) also emitted. These gases are released during the combustion of fossil fuels, such as coal, oil, and natural gas, for electricity production. While electricity is clean at the point of final use, the process of generating it is emissions-intensive.
The good news is that several strategies can help reduce carbon emissions in the electricity sector. Transitioning to clean energy sources, such as nuclear energy and renewable energy, can significantly lower carbon emissions. Nuclear power emits only a few grams of CO2 equivalent per kWh of electricity produced, while renewable sources like wind and solar have similar or lower emissions. Additionally, implementing home-based micro-generators or centralized renewable power plants can contribute to reducing carbon footprints.
Furthermore, technological advancements in electricity distribution, transmission, and utility processes can lead to emission reductions. For instance, electric energy storage systems, such as those employed in organic Rankine systems, can negatively impact net carbon emissions. Policy interventions, such as public benefit funds and "carbon tax" initiatives, have also proven effective in multiple US states.
Some countries and regions have made notable progress in decarbonizing their electricity sectors. For example, Sweden, Luxembourg, and Finland have achieved low-carbon electricity production due to their high share of low-carbon electricity sources. Luxembourg, in particular, has achieved an impressive 87% decrease in decarbonization rates from 1990 to 2023. Climate and energy policies in the European Union have successfully reduced carbon-intensive electricity supply, leading to decreased coal use and increased adoption of renewable sources.
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Electric fields and force
The concept of 'lines of force' was introduced by Faraday to visualise electric fields. These field lines are imaginary and represent the paths a positive charge would follow as it moves within the field. They originate at positive charges and terminate at negative charges, always entering a conductor at right angles and never crossing or closing in on themselves. A hollow conducting body carries its charge on its outer surface, resulting in a zero electric field inside.
The strength of an electric field is influenced by nearby conducting objects, particularly when forced to curve around sharp points. This principle is applied in lightning conductors, where a sharp spike encourages lightning to strike it instead of the building it protects. Electric potential, typically measured in volts, is closely related to electric fields. It represents the energy required to bring a unit charge from an infinite distance to a specific point within the field.
The electric field is conservative, implying that the path taken by a test charge is irrelevant, as all paths between two points expend the same energy. This allows for a unique value of potential difference. While a common reference point for potentials can be infinity, a more practical reference is the Earth itself, assumed to be electrically uncharged due to equal amounts of positive and negative charges.
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Electric potential and energy
Electric potential energy is a type of potential energy that results from conservative Coulomb forces and is associated with the configuration of a particular set of point charges within a defined system. It is measured in joules. An object may be said to have electric potential energy due to its own electric charge or its relative position to other electrically charged objects. The electric potential energy of a system of point charges is defined as the work required to assemble this system of charges by bringing them close together.
The electrostatic potential energy, UE, of one point charge q at position r in the presence of an electric field E is defined as the negative of the work done by the electrostatic force to bring it from the reference position to that position. The electric potential energy of any given charge or system of charges is termed as the total work done by an external agent in bringing the charge or charges together.
Electric potential, on the other hand, is the potential energy at a point in space away from a source charge, based on the value of a test charge. It is the energy associated with a position away from a source charge, based on its distance and the value of the test charge. If we place a charge at a point in space, it will have electrical potential energy at that space based on its charge. Voltage is the electrical potential difference, and it is calculated by the formula: delta V = Vfinal - Vinitial = Work done / q.
A charge will always move towards its most stable position, and the differences in this stability energy for a negative or positive charge of a certain magnitude are called voltage. A charge will always move from a position of higher electrical potential energy to a position of lower electrical potential energy.
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