Beatrice Lang
Electricity is a fundamental form of energy that occurs naturally or can be artificially produced. It is associated with stationary or moving electric charges, which are borne by elementary particles called electrons. These electrons carry a negative charge and their accumulation or motion results in the various manifestations of electricity. The flow of these charged particles creates an electric current, which can be direct or alternating, and is measured in volts. This current is what powers everything from household appliances to medical equipment and space exploration tools.
| Characteristics | Values |
|---|---|
| Definition | "Electricity" is a catch-all term for electric power, electric current, electrical potential, electric fields, etc. |
| Charge carriers | Electrons |
| Charge of electrons | Negative |
| Charge of protons | Positive |
| Charge of antiparticles | Equal and opposite to their corresponding particles |
| Charge of an electron | -1.602176634×10^-19 coulombs |
| Charge of a proton | 1.602176634×10^-19 coulombs |
| Electric potential | The energy required to bring a unit test charge from an infinite distance slowly to a point. Usually measured in volts. |
| Electric field | The force exerted per unit charge. |
| Atoms | The building blocks of the universe. Everything in the universe is made of atoms. |
| Protons | Found in the nucleus of an atom. |
| Neutrons | Found in the nucleus of an atom. Carry no charge. |
| Electrons | Found in shells around the nucleus of an atom. |
| Lightning | A form of electricity. |
| Static electricity | A form of electricity. |
| Electricity | Must travel in a closed circuit. |
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What You'll Learn
- Atoms, the building blocks of the universe, are made of protons, neutrons and electrons
- Protons and electrons carry an electrical charge. Protons are positive, electrons are negative
- Electrons spin around the nucleus in shells
- Applying force can push electrons out of their orbits, causing them to shift from one atom to another. These shifting electrons are electricity
- The flow of electric charge creates electromagnetic waves
Atoms, the building blocks of the universe, are made of protons, neutrons and electrons
Atoms are the building blocks of the universe. They are the smallest unit of an element that still retains its properties. Everything in the universe, from stars to animals, air, and water, is made of atoms.
Atoms are made up of three types of subatomic particles: protons, neutrons, and electrons. Protons and neutrons are heavier than electrons and reside in the nucleus at the center of the atom. Electrons are extremely lightweight and exist in a cloud that orbits the nucleus. The electron cloud has a radius 10,000 times greater than the nucleus.
Protons and neutrons have approximately the same mass, but protons are about 1,835 times more massive than electrons. Protons carry a positive charge, electrons carry a negative charge, and neutrons have no charge, making them electrically neutral. The number of positively charged protons and non-charged neutrons gives mass to the atom. The number of negatively charged electrons that spin around the nucleus equals the number of protons, and this mutual attraction gives the atom structural stability.
The number of protons in an atom is called the atomic number, and it determines the type of element. The number of neutrons may vary, creating different isotopes or nuclides. The mass number of an element is the sum of the number of protons and neutrons in its nucleus. For example, carbon has an atomic number of 6, meaning it has six protons, and a mass number of 12, meaning it has six neutrons.
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Protons and electrons carry an electrical charge. Protons are positive, electrons are negative
Understanding the basics of atoms is essential to comprehending electricity. Atoms are the fundamental units of everything in the universe, from stars to humans and even air and water. At the core of an atom, there is a nucleus composed of protons and neutrons, with electrons orbiting around this nucleus in shells. Protons carry a positive electrical charge, while electrons carry an equal but opposite negative charge. Neutrons, on the other hand, have no charge.
The positive and negative charges of protons and electrons are essential in maintaining the stability of an atom. In a neutral atom, the number of protons and electrons is equal, resulting in a balanced charge of 0. However, atoms can become charged when electrons are transferred between them. When a neutral atom gains an electron, it becomes a negatively charged ion called an anion. Conversely, when a neutral atom loses an electron, it becomes a positively charged ion, known as a cation.
The movement of electrons between atoms creates electricity. For instance, lightning is a natural form of electricity, where electrons move between clouds or from a cloud to the ground. Static electricity is another example, which can be created through friction or contact between materials. When a balloon is rubbed against hair, it gains extra electrons, resulting in a negative charge. This repels the electrons on a nearby surface, causing an attraction between the positively charged surface and the negatively charged balloon.
Protons and electrons play a crucial role in defining the type of atom or element. The number of protons in an atom determines its identity in the Periodic Table of Elements. For example, hydrogen (H) has one proton, while carbon (C) has six. Electrons typically maintain a constant distance from the nucleus, arranged in precise shells. However, the outermost electrons may have a weaker attraction to the protons and can be influenced by external forces, leading to their movement between atoms.
The attraction between positive protons and negative electrons is what holds an atom together. This attraction follows the principle that opposite charges attract each other, while like charges repel. This behaviour is observed in static electricity experiments, where rubbing a plastic strip with fingers transfers electrons, resulting in opposite charges attracting each other. Understanding the behaviour of protons and electrons is fundamental to comprehending the science of electricity and its applications in our daily lives.
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Electrons spin around the nucleus in shells
Atoms are the building blocks of the universe, and everything in the universe is made of atoms. The human body, air, and water are all made of atoms. Atoms are so small that millions of them could fit on the head of a pin.
The center of an atom is called the nucleus, and it is made up of particles called protons and neutrons. Electrons spin around the nucleus in shells. Electrons are attracted to protons, and an atom is in balance when it has an equal number of protons and electrons. Electrons usually remain a constant distance from the atom's nucleus in precise shells.
The existence of electron shells was first observed experimentally in Charles Barkla's and Henry Moseley's X-ray absorption studies. The final form of the electron shell model still in use today was discovered in 1923 by Edmund Stoner. Each shell is composed of one or more subshells, which are themselves composed of atomic orbitals. The first (K) shell has one subshell, called 1s; the second (L) shell has two subshells, called 2s and 2p; and the third shell has 3s, 3p, and 3d.
Danish physicist Niels Bohr was the first person to propose that electrons in an atom couldn't have any orbit they wanted. Instead, they had to be locked into orbits at very specific distances from the nucleus. Bohr's model of the atom gave the arrangement of electrons in their sequential orbits. In 1925, Wolfgang Pauli added a fourth quantum number, "spin", to the old quantum theory period of the Sommerfeld-Bohr Solar System atom, completing the modern electron shell theory.
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Applying force can push electrons out of their orbits, causing them to shift from one atom to another. These shifting electrons are electricity
Atoms are the building blocks of the universe. Everything in the universe, from stars to trees, animals, humans, air, and water, is made of atoms. The center of an atom is called the nucleus, which is made up of particles called protons and neutrons. Electrons spin around the nucleus in shells and are held in these shells by an electrical force. Protons have a positive charge, while electrons carry a negative charge.
Electrons in the outermost shells of an atom sometimes do not have a strong force of attraction to the protons. Applying force to these electrons can push them out of their orbits and cause them to shift from one atom to another. These shifting electrons are what we call electricity. For example, lightning is a form of electricity where electrons move from one cloud to another or jump from a cloud to the ground. When you feel a shock after touching an object following a walk on the carpet, a stream of electrons has jumped to you from that object. This is called static electricity.
There are various ways to create the forces required to accelerate electrons. One way is to shine light on atoms, as light consists of an electromagnetic wave. Another method is to combine chemicals that react, such as burning a gas. Once atoms or electrons are in rapid motion, they can bounce off other atoms, transferring some of their energy.
Electricity can also be created by using the properties of magnets. Moving magnetic fields push and pull electrons. Metals like copper and aluminum have loosely held electrons. Moving a magnet around a coil of wire or vice versa pushes the electrons in the wire and generates an electrical current.
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The flow of electric charge creates electromagnetic waves
The concept of electricity has evolved over millennia, from an intellectual curiosity to a well-understood phenomenon. Electricity is the flow of electrically charged particles, almost always electrons, which can be bound in a wire or free in space. These charged particles create electric fields, which exert forces on other charged particles. When these charges accelerate, they produce electromagnetic waves.
Electromagnetic waves are a type of electromagnetic radiation (EMR) that encompasses a broad spectrum, including radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. EMR is characterised by its ability to self-propagate through the electromagnetic field, carrying momentum and radiant energy. The energy transported by electromagnetic waves is known as electromagnetic radiation or light and can be naturally emitted by celestial bodies or artificially generated.
The production of electromagnetic waves is closely tied to the behaviour of charged particles. When a charged particle moves, it generates an electric field, and if it accelerates, it produces an electromagnetic wave. The electric field exerts a force on other charged particles, causing positive charges to accelerate in the direction of the field and negative charges to accelerate in the opposite direction. This acceleration results in the creation of a magnetic field, which further influences the motion of charged particles.
The electric and magnetic fields generated by accelerating charges are fundamental to the nature of electromagnetic waves. These fields are perpendicular to each other and travel through empty space at the speed of light. The magnitude of the electric field is directly proportional to the charge and the acceleration of the charged particle. The magnetic field, on the other hand, is perpendicular to the direction of propagation and has a magnitude of Erad = c x Brad in free space.
The understanding of electromagnetic waves and their relationship to electricity and magnetism is largely attributed to the work of James Clerk Maxwell in the 19th century. Maxwell's equations revealed the wave-like nature of electric and magnetic fields and their ability to couple and form electromagnetic waves. Heinrich Hertz, a German physicist, successfully applied Maxwell's theories to the production and reception of radio waves, providing concrete evidence for the existence of electromagnetic waves.
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Frequently asked questions
Electricity is a fundamental form of energy that occurs naturally (e.g. lightning) or can be artificially produced (e.g. generators). It is expressed in terms of the movement and interaction of electrons.
There are three main ways to generate electrical energy: fossil fuels, renewable energy sources, and nuclear energy.
An electric current is when electricity travels in a closed circuit, following a complete path from one place to another.
Electricity is the flow of electrically charged particles, specifically electrons. When voltage is applied to a conductor, the electrons move and create a current.
