Umair Gaines
The term electricity is a colloquial term that is used to refer to the thing that makes the lights in our homes turn on. In physics, electricity is referred to as electric phenomena in general or electric power. It is the set of physical phenomena associated with the presence and motion of matter possessing an electric charge. The motion of electric charges is an electric current and produces a magnetic field. The electric charge is carried by electrons, which are negatively charged and are loosely held to atoms of conductive materials. These electrons are freed from atoms and get them to flow in a generally uniform direction, which is what we call electricity.
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Electric charges
Electric charge, a basic property of matter, is the flow of electricity. It is carried by some elementary particles, such as electrons and protons, and governs how the particles are affected by an electric or magnetic field. Electric charge can be positive or negative and occurs in natural units that are neither created nor destroyed.
The atom is the building block of the universe; everything, from stars to animals, is made of atoms. Atoms are made up of protons, neutrons, and electrons. The protons and neutrons are densely packed together in the centre of the atom, known as the nucleus, while the electrons orbit the nucleus in shells. The number of protons in an atom determines what chemical element it is. For example, hydrogen has one proton, copper has 29, and plutonium has 94.
Electrons are the carriers of electric charge. They always carry a negative charge. Protons, on the other hand, always carry a positive charge. These charges are equal in magnitude but opposite in polarity. Electrons in the outermost shells of an atom, called valence electrons, can be freed from their orbit with enough outside force. Applying force can make these electrons shift from one atom to another, and these shifting electrons are electricity.
The distinction between positive and negative charges is fundamental to comprehending the behaviour of electrically charged objects. Opposite charges, such as positive and negative, attract each other, while like charges repel each other. This principle is essential in understanding the interaction of charged particles and various concepts in electromagnetism.
The SI unit of electric charge is the coulomb (C), defined as the quantity of charge passing through an electrical conductor carrying one ampere for one second. The quantity of electric charge can be directly measured with an electrometer or indirectly with a ballistic galvanometer.
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Electric circuits
Electricity is the set of physical phenomena associated with the presence and motion of matter possessing an electric charge. It is related to magnetism, with both being part of the phenomenon of electromagnetism, as described by Maxwell's equations. Electric circuits are a crucial aspect of understanding electricity and its applications.
An electric circuit is a pathway for transmitting electric current. It consists of a device that provides energy to charged particles, such as a battery or generator, and devices that utilise this current, like lamps, electric motors, or computers. The connecting wires or transmission lines facilitate the flow of charge. A circuit can be visualised as a continuous loop of conductive material, allowing charge carriers, typically electrons, to move continuously.
There are two main types of electric circuits: direct-current circuits and alternating-current circuits. In a direct-current circuit, the current flows only in one direction. On the other hand, an alternating-current circuit carries a current that pulsates back and forth multiple times per second, similar to the circuits found in most households.
The performance of electric circuits is mathematically described by laws such as Ohm's law and Kirchhoff's rules. Understanding these circuits is essential for various applications, from powering household appliances to the intricate workings of electronics and modern technology.
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Electrostatics
The concept of electric fields was introduced by Michael Faraday, who termed them ''lines of force'. These field lines are imaginary lines that represent the path a positive charge would take when forced to move within the field. The field lines originate at positive charges and terminate at negative charges. They must enter any conductor at right angles and do not intersect or close in on themselves.
The charges that create these electric fields are the result of the unique properties of protons and electrons in an atom. Protons and electrons carry an electric charge, with protons having a positive charge and electrons a negative one. These charges are equal in magnitude, and when in close proximity, they nullify each other's charge, resulting in an electrically neutral atom. However, atoms are not always neutral. The outermost electrons, called valence electrons, require relatively little force to be freed from the atom. By applying an electrostatic force, either through repulsion by another negative charge or attraction by a positive charge, these valence electrons can be ejected from the atom, creating a free electron.
The movement of these free electrons between bodies generates the familiar phenomenon of static electricity or electrostatics. When you comb your hair, for example, electrons from your hair's surface relocate to the comb's surface. This results in the comb having an excess of electrons and becoming negatively charged, while your hair strands have a shortage of electrons and become positively charged. This leads to the attraction between the comb and your hair.
Electrostatic phenomena are described by Coulomb's law, which states that the force between two charged particles is proportional to their charges and the inverse square of their separation. This law helps us understand the behaviour of electric charges and the resulting electrostatic forces.
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Electric fields
The strength of an electric field is stronger near charged objects and weaker further away. The SI unit for measuring the strength of an electric field is the volt per meter (V/m), which is equal to the newton per coulomb (N/C). The electric field is defined as the force experienced by a small stationary test charge at a specific point in space, divided by the charge. This force is a vector, meaning it has both magnitude and direction, so an electric field can be described by a vector field.
The study of electric fields created by stationary charges is called electrostatics. Electric fields and magnetic fields are both manifestations of the electromagnetic field, one of the four fundamental interactions of nature. The interaction between the electric field and the atomic nucleus is the force that holds the nucleus and electrons together in atoms. Similarly, the interaction between atoms in an electric field is the force responsible for chemical bonding that results in molecules.
In a closed circuit of conductive material, electric fields provide the path for electrons to flow continuously. The charges are propelled by an electric field, which pushes electrons from a point of low potential energy to higher potential energy.
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Electrons
The movement of electrons in a conductor can be influenced by magnets, which create areas of high electron concentration. This movement of electrons generates a magnetic field and is the basis for electromagnetism. Electrons can also be energised by light energy, as discovered by Albert Einstein in his explanation of the photoelectric effect, leading to the quantum revolution.
The behaviour of electrons is essential in understanding electricity and its applications in technology. By manipulating electrons, we can create electric currents and power equipment, such as in electric circuits. Additionally, certain materials known as insulators, such as glass, rubber, plastic, and air, are designed to prevent the flow of electrons.
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Frequently asked questions
Electricity is the set of physical phenomena associated with the presence and motion of matter possessing an electric charge. It is related to magnetism and is part of the phenomenon of electromagnetism.
Atoms are made of two kinds of electric charge. At the center of atoms are positive charges, and flying around the outside are negative charges. These negative charges are called electrons and are not held very tightly in the atom, so it is easy for them to move around. These moving electrons make up what we call electricity.
Common phenomena related to electricity include lightning, static electricity, electric heating, and electric discharges. Lightning is a form of static electricity.
"Electricity" is a colloquial term. In physics, you might use terms like current, voltage, energy, and power, which are all different and have specific definitions.
