Beatrice Lang
The basic concepts of electricity are built on understanding atoms, their components, and how they interact with each other. Atoms are composed of three fundamental particles: protons, neutrons, and electrons. The protons and neutrons are tightly bound together in the atom's nucleus, with the number of protons determining the atom's elemental identity. Surrounding this nucleus are electrons, which carry electric charge and can be influenced by an electric field. Electric charge refers to a property of matter, like mass or volume, and it comes in two types: positive or negative. When a valence electron escapes its atom's orbit, it becomes a free electron, allowing charge to move through a circuit. Electric circuits are closed loops made of conductors and other electrical elements that allow electric current to flow. Electric current refers to the flow of electric charge as electrons move through a circuit, transforming energy from electrical to light or heat.
| Characteristics | Values |
|---|---|
| Electric charge | A fundamental property of matter that can be positive or negative |
| Electric current | The flow of electric charge carried by electrons as they jump from atom to atom |
| Electric circuit | A closed loop made of conductors and other electrical elements through which electric current can flow |
| Voltage | The amount of electric potential energy divided by the amount of charge at a point in an electric field |
| Electric potential | Helps define how much energy is stored in electric fields |
| Electric potential energy | The energy stored in electric fields |
| Resistance | |
| Conductors | Atoms that let current flow easily |
| Insulators | Atoms that don't let current flow easily |
| Electrons | Negatively charged particles that can move between atoms |
| Protons | Positively charged particles |
| Neutrons | Keep protons in the nucleus and determine the isotope of an atom |
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Electric charge
The two general types of electric charge are positive and negative. A negatively charged object has an excess of electrons on its surface, while a positively charged object is electron-deficient. Objects with opposite charges attract each other, whereas like charges repel each other. This fundamental principle is pivotal in understanding the interaction of charged particles.
The unit of electric charge in the metre–kilogram–second and SI systems is the coulomb, named after the French naturalist Charles Augustin de Coulomb. It is defined as the amount of electric charge that flows through a cross-section of a conductor in an electric circuit in one second when the current has a value of one ampere. One coulomb consists of 6.24 x 10^18 natural units of electric charge, such as individual electrons or protons. The smallest unit of electric charge is the charge carried by an electron, which is approximately -1.6 x 10^-19 coulombs. Faraday and Ampere-Hour are other units of electric charge. Smaller units of electric charge include the microcoulomb (µC), nanocoulomb (nC), and picocoulomb (pC).
In an isolated system, electric charge is conserved, meaning the total electric charge within the system remains constant over time. This is known as charge conservation.
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Electric current
The electrons on the outer orbit of an atom are called valence electrons. With sufficient external force, valence electrons can escape the atom's orbit and become free to carry charge. Electrons always carry a negative charge, while protons, another type of subatomic particle, carry a positive charge. These two types of charges are essential to the concept of electric current.
The ease with which electric current flows varies depending on the type of atom. Atoms that facilitate the flow of electric current are called conductors, while those that hinder the flow are known as insulators. Metals, for example, are good conductors because their outermost electrons are loosely bound and can move freely between adjacent atoms.
Electric circuits, another key concept in electricity, are closed loops made of conductors and other electrical elements that allow electric current to flow. A basic electric circuit consists of a battery, a lamp, and a wire connecting the two. More complex circuits can consist of numerous components connected by conductors in specific ways to ensure the proper flow of electric current.
The magnitude of electric current can be significant in a short circuit, leading to a dramatic release of energy, usually in the form of heat. This phenomenon underscores the potential dangers associated with electricity and the importance of constructing circuits that can harness and utilise this energy in practical applications.
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Electric circuits
The most basic elements of circuits consist of a voltage source, a load, and wires connecting them. Voltage sources create 'pressure', or voltage, in an electric circuit. A battery provides voltage and current through wires to different loads. A load is a device that uses the current, such as a lightbulb. Resistors are electrical components designed with a specific amount of resistance used to limit the voltage and current in a circuit. They are passive components, meaning they can only consume power. Adding a resistor to the circuit will reduce the amount of current flowing through a load to prevent damage.
There are many different kinds of circuits, like resistive circuits or parallel circuits. A direct-current circuit carries current that flows only in one direction. An alternating-current circuit carries current that pulsates back and forth many times each second, as in most household circuits. A parallel circuit comprises branches so that the current divides and only part of it flows through any branch. The voltage across each branch of a parallel circuit is the same, but the currents may vary.
It is important to note that any break in a circuit will prevent the flow of charge carriers. This applies to any break, anywhere in the circuit.
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Voltage and current
Voltage, current, and resistance are the three fundamental concepts of electricity. They are the basic building blocks required to manipulate and utilize electricity.
Voltage
Voltage is the difference in electric charge between two points. It is the amount of potential energy between two points on a circuit, with one point having more charge than the other. This difference in charge between the two points is called voltage. It is measured in volts (V) and the unit is named after the Italian physicist Alessandro Volta, who invented the first chemical battery. Voltage is like the pressure that pushes water through a hose.
Current
Current is the rate at which the electric charge is flowing. It is like the diameter of the hose through which water is flowing. The wider the hose, the more water will flow through. It is measured in amps (I or A). The water flowing back and forth within the hose many times per second is known as alternating current or AC. It is created by electric generators or alternators.
Electricity is the movement of electrons, which create a charge that can be harnessed to do work. Voltage and current are related to each other. Voltage is equal to current multiplied by resistance (V = I x R). Changing one of them in a circuit will change the other two. For example, if you add resistance to a circuit and keep the voltage the same, the current will be reduced.
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Resistance
The resistance of an object depends on the material it is made of, its size, and its shape. For example, a thick copper wire has lower resistance than a thin copper wire of the same length. This is because it is more difficult to push water through a long, narrow pipe than a wide, short pipe. Similarly, a long, thin wire will have higher resistance than a short, thick wire of the same material. The nature of the material is also important. Electrons can flow freely through a copper wire, but not as easily through a steel wire of the same shape and size. This is due to the microscopic structure and electron configuration of the material, a property called resistivity.
According to Ohm's law, the resistance of an object is defined as the ratio of voltage across it to the current through it. For many materials, the current through the material is directly proportional to the voltage applied across it. Therefore, the resistance and conductance of objects made of these materials are constant. These materials are called ohmic materials and include wires and resistors. However, some materials and components do not obey Ohm's law, and the current is not proportional to the voltage. These are called non-ohmic materials and include diodes and fluorescent lamps.
The only materials that have zero resistance are superconductors. As the temperature increases, the resistance of pure metals also increases, due to an increase in the number of electrons in the conduction band. Conversely, as the temperature increases, the resistance of insulators decreases.
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Frequently asked questions
Electricity is defined as the flow of electric charge. It is a property of matter that can be measured and can be either positive or negative.
An electric circuit is a closed loop made of conductors and other electrical elements through which electric current can flow. A simple electric circuit consists of a battery, a lamp, and a wire connecting the two.
Atoms that allow electric current to flow easily are called conductors. Conductors are the opposite of insulators, which do not let current flow easily.
