Trystan Casey
The term 'electric' is used to describe something that is powered by electricity, like a battery, or produces or transmits electricity, like an electric generator. The word is derived from the Greek word 'elektron', meaning amber, as ancient Greek philosophers discovered that rubbing amber with cloth allowed it to pick up light objects. The term 'electricity' refers to a fundamental form of energy that occurs naturally, for example in lightning, or can be artificially produced, for example with a generator.
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Electric shock
The word "electric" is derived from the Greek word for amber, "elektron". While certain electrical phenomena have been known since ancient times, it is only in modern times that electricity has been fully understood and harnessed as a form of power. The term "electric" is used to describe something that is charged with electricity, powered by electricity, or produces or transmits electricity.
An electric shock occurs when a person comes into direct contact with an electric current. The injury depends on the density of the current, tissue resistance, and duration of contact. Very small currents may be imperceptible or only produce a light tingling sensation. However, a shock caused by a low and otherwise harmless current could startle an individual and cause injury due to jerking away or falling. A strong electric shock can cause painful muscle spasms severe enough to dislocate joints or even break bones. Larger currents can result in tissue damage and may trigger ventricular fibrillation or cardiac arrest. Burns are the most common injury from electric shock and are usually most severe at the points of contact with the electrical source and the ground.
If the current has a direct pathway to the heart, a much lower current of less than 1 mA (AC or DC) can cause fibrillation. If not immediately treated by defibrillation, ventricular fibrillation is usually lethal, causing cardiac arrest. Short single DC pulses induce VF dependent on the amount of charge transferred to the body, making the amplitude of the electrical stimulus independent of the exact amount of current flowing through the body for very short pulse durations. DC shocks of short duration are usually better tolerated by the heart, even at high currents, and rarely induce ventricular fibrillation compared to lower currents with longer durations.
Exposure to high-voltage electricity (greater than 500 volts) can cause serious damage. If a high-voltage line has fallen to the ground, there may be a circle of current spreading out from the tip of the line, and it is best to call emergency services. A victim who has been thrown from a height or has received a severe shock causing multiple jerks may have a serious neck injury and should not be moved without first protecting their neck. Electric shock can also cause interference with nervous control, especially over the heart and lungs, and has been shown to cause neuropathy in some cases at the site where the current entered the body.
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Electric generators
The word "electric" is derived from the Greek word for amber, "elektron". The ancient Greeks discovered that rubbing amber with a piece of cloth caused the amber to pick up light objects, such as feathers. This phenomenon is due to static electricity, which was first discovered through the friction produced by rubbing amber.
Electricity is a fundamental form of energy that occurs naturally, such as in lightning, or can be artificially produced by rubbing together two different materials, by chemical reactions, or through the use of generators. Electric generators are devices that convert other forms of energy into electricity. They are based on the discovery made by scientist Michael Faraday in 1831, who found that moving a magnet inside a coil of wire induces an electric current to flow through the wire. This relationship between magnetism and electricity led to the design of the electromagnetic generators that are commonly used today.
Electromagnetic generators use an electromagnet, which is a magnet produced by electricity, rather than a traditional magnet. They consist of a rotating part called the rotor and a stationary part called the stator, which together form a magnetic circuit. The rotor is an electromagnetic shaft, while the stator is a series of insulated wire coils that form a stationary cylinder surrounding the rotor. When the rotor is turned, an electric current is generated in each section of the wire coil, and each section becomes a separate electric conductor. The currents in the individual sections then combine to form a large current that is transmitted through power lines to consumers.
There are two main types of electromagnetic generators: dynamos and alternators. Dynamos generate pulsing direct current (DC) through the use of a commutator, which is a set of rotating switch contacts on the armature shaft. The commutator reverses the connection of the armature winding to the circuit with each 180-degree rotation of the shaft, creating a pulsing DC current. Alternators, on the other hand, generate alternating current (AC). A coil of wire rotating in a magnetic field produces an AC current that changes direction with each 180-degree rotation.
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Electric fields
The word "electric" comes from the Greek word for amber, "elektron". The ancient Greeks discovered that rubbing amber with cloth enabled it to pick up light objects, such as feathers. This phenomenon is caused by static electricity, which is a fundamental form of energy that occurs naturally or can be artificially produced.
The study of electric fields created by stationary charges is called electrostatics. Field lines due to stationary charges have several important properties, including that they always originate from positive charges and terminate at negative charges. Electric fields are also important in atomic physics and chemistry, where the interaction in the electric field between the atomic nucleus and electrons is the force that holds these particles together in atoms. The interaction in the electric field between atoms is also responsible for the chemical bonding that results in molecules.
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Electric potential
The term "electric" is derived from the Greek word "elektron," which means amber. The word "electric" is used to describe something that is charged with electricity, such as a battery-operated flashlight, or something that produces or transmits electricity, like an electric generator.
The electric potential can be understood as the potential energy per unit charge. In other words, it is the work done to move a positive charge through a distance in an electric field. The electric force exerted by the field on the positive charge is given by the equation F = qE, where F is the force, q is the charge, and E is the electric field. To move the charge from one point to another within the electric field, an equal and opposite force must be applied.
The concept of electric potential is closely linked to potential energy. The potential energy of a charge in an electric field depends on its position, with the energy increasing when the charge moves against the electric field and decreasing when it moves with the field. The electric potential, therefore, represents the amount of work needed to move a charge between two points in an electric field.
In the International System of Units (SI), electric potential is expressed in joules per coulomb, which is also known as a volt (V). Differences in potential energy at different points in an electric field can be measured using a voltmeter.
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Electric current
The word "electric" is derived from the Greek word for amber, "elektron". The term was used long before electricity was fully understood or harnessed as a form of power in the 19th century. In the 17th century, scientists used the term "electric" to describe materials like wool that produced sparks of static electricity when rubbed.
The conventional direction of current, also known as conventional current, is arbitrarily defined as the direction in which positive charges flow. In a conductive material, the moving charged particles that constitute the electric current are called charge carriers. In metals, which make up the wires and other conductors in most electrical circuits, the positively charged atomic nuclei of the atoms are held in a fixed position, and the negatively charged electrons are the charge carriers, free to move about in the metal.
In alternating current (AC) systems, the movement of electric charge periodically reverses direction. AC is the form of electric power most commonly delivered to businesses and residences. In contrast, direct current (DC) refers to a system in which the movement of electric charge is in only one direction. Direct current is produced by sources such as batteries, solar cells, and electric machines of the dynamo type.
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Frequently asked questions
The term 'electric' is used to describe something that is powered by electricity, such as a battery-operated flashlight, or that produces or transmits electricity, like an electric generator.
The word 'electric' is derived from the Greek word 'elektron', meaning amber. The ancient Greeks discovered that when amber is rubbed with cloth, it can attract light objects like feathers. This property is due to the build-up of static electricity.
Electricity is a fundamental form of energy that can be observed in positive and negative forms. It occurs naturally, for example, in lightning, or can be artificially produced, for example, using a generator.
Everyday examples of things that are electric include a flashlight, an electric generator, an electric fence, a power socket, and an electric wheelchair.
The term 'electric' refers to something that is powered by electricity or produces/transmits electricity. On the other hand, 'electronic' refers to devices or circuits that use electrons to function, such as computers, smartphones, and other electronic devices.
