Umair Gaines
Electricity is a set of physical phenomena associated with the presence and motion of electrically charged matter. The motion of electric charges is an electric current and produces a magnetic field. The movement of electrons from one atom to another is what creates lightning, and the movement of electrons within a wire is what powers a lightbulb. The movement of electrons within a conductor is electricity, and electricity can be converted into other forms of energy.
| Characteristics | Values |
|---|---|
| Definition | Electricity is the set of physical phenomena associated with the presence and motion of matter possessing an electric charge. |
| Basic Unit | Electricity is measured in units of power called Watts, named after James Watt, the inventor of the steam engine. |
| Flow | Electricity flows through the space around the wires – through the air around high-voltage transmission lines, through the insulating plastic encasing the wires, and through the vacuum or gas inside the light bulb. |
| Flow Direction | Electrons flow in the opposite direction to conventional current as they have a negative charge. |
| Flow Measurement | The flow of electricity is measured in (electron) charges per second or amperes. |
| Conversion | Electricity can be converted to other forms of energy, such as mechanical power. |
| Applications | Electricity is used in electric power, telecommunications, transport, heating, refrigeration, and many other applications. |
| Storage | Electricity storage is challenging due to the need to match demand and supply. Batteries, chemical storage, thermal storage, and mechanical storage are some of the technologies used for electricity storage. |
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What You'll Learn
Electric charge and electric fields
Atoms are the building blocks of the universe. Everything in the universe, from stars to animals, is made up of atoms. These atoms are composed of a nucleus, made of protons and neutrons, and electrons that spin around the nucleus in shells. Protons have a positive charge, and electrons have a negative charge. The positive and negative charges are equal and opposite, keeping the atom in balance. However, when there is an unequal number of protons and electrons, the atom or molecule becomes an ion with a net electric charge.
Electricity is the set of physical phenomena associated with the presence and motion of matter possessing an electric charge. The motion of electric charges creates an electric current, which produces a magnetic field. This electric current is what we commonly refer to as electricity, and it powers our homes, runs our appliances, and enables long-distance communication. The electric charge itself is measured in coulombs, and Coulomb's law gives the magnitude of the force between point charges.
The presence of either a positive or negative electric charge generates an electric field. An electric field is a region of space altered by the presence of an electric charge. It mediates the electric force between a source charge and a test charge, pointing away from positive charges and towards negative charges. This electric field is responsible for the behaviour of charged particles and plays a crucial role in various phenomena, including lightning, static electricity, and the behaviour of electrons in circuits.
Lightning, for example, is a form of electricity where electrons move from one cloud to another or from a cloud to the ground. Static electricity, on the other hand, is a buildup of electric charge that creates an electric field strong enough to make your hair stand up or make molecules of glue stick together. In electric circuits, the movement of electrons is directed by the electric field, allowing us to control and utilise electricity for various applications.
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Electric current
Electricity is the movement of matter with an electric charge. Atoms are the building blocks of the universe, and everything in the universe is made of atoms. The protons and electrons of an atom carry an electrical charge. Protons have a positive charge, while electrons have a negative one. An atom is in balance when it has an equal number of protons and electrons.
The motion of electrically charged particles is called electric current. Electric current is the average velocity of electrons, measured in amps. The movement of electrons in a conductor is electricity, and this movement can be converted into other forms of energy. For example, in a light bulb, the energy is channelled into the light bulb's metal filament, scattering the free electrons in the filament. These electrons then bump into the cores of the atoms within the filament, transferring kinetic energy to thermal energy, making the filament hot enough to glow.
Electricity is also used to power electric motors, which provide a clean and efficient means of motive power. Electric vehicles, such as buses, trains, and cars, carry a power source such as a battery or collect current from a sliding contact. Electricity is used within telecommunications, and the electrical telegraph was one of its earliest applications.
The flow of electricity is measured in electron charges per second or amperes. The electrical current generated by power stations and received at homes is called alternating current (AC) and continually changes direction. The frequency of the changing current and voltage are measured in Hertz or cycles per second.
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Energy transfer
- Mechanical work: This involves a force moving an object through a distance. For example, a child sliding down a slide is an example of mechanical work, as the force of gravity acts on the child to move them down the slide.
- Electrical work: Electrical work involves charges moving due to a potential difference. The potential difference, or voltage, is the measure of the energy given to the charge carriers in a circuit, and it creates an electric current.
- Heating: Heating can be caused by a temperature difference, either electrically or by a chemical reaction. For example, electrical generation often involves the production of heat at a power station.
- Radiation: Radiation is energy transferred as a wave, such as light or infrared radiation.
Electricity is a convenient way to transfer energy and has been adapted for numerous uses. It is related to magnetism, and both are part of the phenomenon of electromagnetism. Electricity plays a central role in modern technologies, powering equipment and electronics. The electric motor, for example, provides a clean and efficient means of motive power. Electrification is also expected to contribute to the decarbonisation of sectors such as transport and heating.
The movement of electricity itself involves the flow of electrons with a negative charge. These electrons move in the opposite direction to conventional current, which traditionally flowed from positive to negative. The flow of electrons creates an electric current and produces a magnetic field.
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Electric heating
Electricity is a set of physical phenomena associated with the presence and motion of matter with an electric charge. Electric heating is one of the many phenomena related to electricity.
Electric resistance heating is 100% energy efficient, as all the incoming electric energy is converted to heat. However, due to electricity generation and transmission losses, electric heat is often more expensive than heat produced by combustion appliances. In addition, the generation of electricity itself often relies on coal, gas, or oil generators that only convert about 30% of the fuel's energy into electricity. Despite this, electricity is still a highly practical energy source for heating, and electric heating is becoming more common. For example, electric heat pumps are preferable in most climates as they can easily cut electricity use by 50% when compared to electric resistance heating.
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Electric power
From the standpoint of electric power, components in an electric circuit can be categorized as active devices (power sources) or passive devices (loads). Active devices, such as electric generators and batteries, convert energy from some other form (mechanical, chemical, etc.) into electric potential energy. Passive devices, on the other hand, allow the flow of current from higher potential to lower potential, with the direction of conventional current flow being from the positive terminal to the negative terminal.
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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.
Electric charge refers to the presence of either a positive or negative charge on an object. Protons have a positive charge, while electrons have a negative charge.
Electricity is the motion of charged particles, specifically electrons. These electrons flow from the negative end of a battery to the positive end.
Electrical current refers to the flow of positive charge from the positive to the negative end. Since electrons have a negative charge, they flow in the opposite direction of the conventional current.
Energy from the electric field surrounding the light bulb is transferred to the electrons in the filament, causing them to scatter at high speed. These electrons then bump into the cores of the atoms in the filament, converting their kinetic energy into thermal energy, which makes the filament hot enough to glow.
