Trystan Casey
Electrical systems are made up of electrical components that transport electrical energy for a particular purpose. They are designed as combinations of fundamental components such as resistors, capacitors, and inductors. These systems are used to supply, transfer, and use electric power. Electrical systems can be as small as those found in homes or as large as the electrical grid that provides power to homes and industries within an extended area. The electrical grid can be divided into the generators that supply the power, the transmission system that carries the power from the generating centers to the load centers, and the distribution system that feeds the power to nearby homes and industries.
| Characteristics | Values |
|---|---|
| Definition | An electrical system is a network of electrical components that allow for the transportation of electrical energy for a particular purpose. |
| Components | Motors, resistors, capacitors, transistors, wires, substations, generators, transformers, etc. |
| Quantities | Current and voltage. |
| Current | The net motion of electrons flowing through the wires due to the presence of an electrical force. |
| Voltage | The difference in electrical potential between two points in a circuit, causing the electrical current to flow in a wire. |
| Circuit | A combination of resistors, capacitors, and inductors. |
| Earthing | A method used to connect an electrical system to the earth with a wire, providing protection against electric shock and electrocution. |
| Safety | Modern electrical systems have safety features such as grounded outlets, circuit breakers, and energy efficiency. |
| Examples | Electrical power grids, phones, computers, televisions, automobiles, aircraft, etc. |
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What You'll Learn
Electrical systems in homes
An electrical system is a network of electrical components that work together to supply, transfer, and use electrical energy for a particular purpose. Electrical systems have become increasingly important since the late 19th century, when electricity first became commercially available to the general public.
Electricity enters a home through a service head from a series of outdoor power lines or an underground connection. A typical service head consists of two 120-volt wires and one neutral wire that deliver power to lights and appliances around the home. The 120-volt circuits use one phase of the electrical service to power standard home appliances, while certain larger appliances such as water heaters, electric ranges, or clothes dryers require a 240-volt circuit, which is created using both 120-volt wires and the neutral wire.
The main service panel, often called the breaker box, is the heart of a home's electrical system. It contains multiple circuit breakers or fuses that control the flow of electricity to various circuits throughout the home. Each circuit breaker manages the electrical flow to a specific area or appliance, allowing a homeowner to isolate power to different parts of the home. These breakers or fuses are designed to trip or blow when there is excessive current or a short circuit, protecting the wiring and preventing fires.
It is important for homeowners to understand fundamental electrical concepts and keep their electrical systems properly maintained and in safe working condition. Old houses are particularly prone to electrical problems, such as underpowered systems, ungrounded circuits, deteriorated or missing insulation, and outdated fuses. Regular electrical panel inspections and maintenance by qualified electricians are crucial to ensure optimal functionality and safety.
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Voltage and current sources
An electrical system is a network of electrical components that work together to supply, transfer, and use electric power. Electrical systems are all around us, from the electrical power grids that light up our homes to the smartphones and computers we use daily.
Voltage sources are the most common power sources and can be represented by three common symbols. The first is a circle with a plus/minus sign inside, which can represent any independent voltage source (AC, DC, or both). The second symbol is a circle with a sinusoid, indicating an AC power source with a possible DC offset. The third symbol, made up of three lines, represents a battery, which is a DC voltage source. An ideal voltage source has zero internal resistance and will produce a constant output voltage equal to its EMF. However, in reality, voltage sources have finite internal resistance and are known as practical or real voltage sources.
Current sources, on the other hand, are less commonly encountered in practice but are still important in academia and certain careers. They are used to model components like transistors, op-amps, or specific ICs. While voltage sources provide the energy needed to create a voltage (potential difference) between two points in a circuit, current sources deliver a specified electric current to the circuit.
Both voltage and current sources can be further classified into independent and dependent sources. Independent sources are those whose output is not influenced by the voltage or current in any other part of the circuit. In contrast, dependent sources are governed by the voltage or current in other parts of the circuit and are used in modeling the behaviour of electronic devices.
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Capacitors and resistors
An electrical system is a network of electrical components that work together to supply, transfer, and use electrical power. It includes power sources, transmission systems, and distribution networks.
Now, onto capacitors and resistors.
Capacitors
Capacitors are critical components of electrical systems, storing electrical potential energy. They are passive, two-terminal devices that store electric charge. The simplest form of a capacitor is a parallel plate capacitor, consisting of two conducting plates separated by a small distance. When connected to a power source, a capacitor creates a build-up of electrons on one side, resulting in a separation of charges. The amount of electrical potential energy stored in a capacitor is measured in farads (F) and defined as its capacitance. Capacitors are essential in timing devices, such as those used in mobile phones, high-speed trains, and stock market trading.
Resistors
Resistors are passive components that resist or impede the flow of electric current in a circuit. They are also two-terminal devices. The resistance of a material is the inverse of its conductivity. Resistors are commonly made of materials with high electrical conductivity, such as silver or copper, which exhibit low resistance. Resistor failure often occurs at points of higher local resistance, where the resulting heat increases resistance and leads to further heating.
Combining capacitors and resistors in a circuit allows for the selective filtering of electronic signals, letting through only certain frequencies. This combination is used in building passive filters. Additionally, capacitors and resistors, along with inductors, are analysed in the study of electromagnetic field analysis and exhibit characteristics of each other at higher frequencies.
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Safety and maintenance
An electrical system is a network of electrical components that work together to supply, transfer, and use electrical power. It is a broad term that can be used to describe anything from power grids to smartphones. Electrical systems are made up of various components that allow for the transportation of electrical energy for a particular purpose.
Electrical safety is of paramount importance, as electricity can cause severe injury or even death. It can also cause damage to property. Therefore, it is crucial to follow safety standards and regulations to ensure the safe installation, operation, and maintenance of electrical systems and equipment. These standards are designed to protect people from electrical hazards such as electric shock, arc flash, and explosion.
The Occupational Safety and Health Administration (OSHA) sets forth comprehensive electrical safety standards for the workplace, covering various aspects such as personal protective equipment (PPE), wiring methods, and safety-related work practices. Employers are encouraged to develop and implement electrical safety programs that include risk assessment, safety procedures, and employee training.
Lockout/Tagout (LOTO) procedures are critical for ensuring the safety of workers performing maintenance or repairs on electrical systems. These procedures involve disconnecting the electrical power and securing the energy-isolating device to prevent accidental energization. Regular maintenance of electrical equipment and systems is necessary to ensure they remain in a safe condition.
When working with or near electrical systems, it is essential to use proper safety equipment and PPE. All incidents should be reported to a supervisor immediately. Only qualified persons with the necessary training and experience should work on exposed energized electrical conductors and circuit parts.
To maintain electrical equipment and systems, users should check the equipment each time before use and remove it from use if any issues are identified. Repairs and maintenance should be carried out by competent persons with the required skills and knowledge to perform the work safely. Regular inspecting and testing of fixed wiring installations are important to minimise deterioration and potential dangers.
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History of electrical systems
Electrical systems have evolved over centuries, from early human awareness of electricity in nature to today's complex global power markets and electronic devices.
Early Discoveries and Experiments
The ancient Egyptians recognised electric fish, depicted in carvings dating back to 2725 BC, and Greeks, Romans, and Egyptians reportedly used these fish to treat epilepsy. In the 18th century, Englishman Stephen Gray demonstrated electric conduction, leading to the invention of glass friction generators in Leyden, Germany, in 1740. This inspired a series of experiments and inventions, including Italian Alessandro Volta's creation of the battery in 1800, Humphry Davy's first effective "arc lamp" in 1808, and Hans Christian Oersted's 1820 demonstration of the relationship between electricity and magnetism. A pivotal moment came in 1820 when Michael Faraday and Joseph Henry invented a primitive electric motor, and by 1831, they had documented that an electric current could be produced in a wire moving near a magnet, thus demonstrating the principle of the generator. The first rudimentary dynamo was invented by Hippolyte Pixii in 1832, and the first commercial telegraph was demonstrated by Cooke and Wheatstone in 1837, revolutionising long-distance communication.
Lighting the Way
In the late 19th century, cities worldwide began illuminating their streets with arc lighting, powered by dynamos. In 1878, Paris's Avenue de l'Opera and Place de l'Opera were lit up using Yablochkov arc lamps, powered by Zénobe Gramme alternating current dynamos. This technology soon spread to other cities, with central power plants providing electricity to multiple customers via electrical transmission lines. Charles F. Brush's company in Ohio played a key role in this transformation, supplying direct current generators to power arc lamps. Thomas Edison's invention of a less powerful incandescent lamp in 1879 offered a more practical lighting solution, and he established a central generating station in lower Manhattan in 1882.
Powering the Masses
The late 19th century saw the emergence of utility companies selling electricity from central plants to multiple customers. The California Electric Company (now PG&E) in San Francisco in 1879, and the Grand Rapids Electric Light & Power Company in 1880, were pioneers in this field, marking the beginning of widespread electricity distribution.
Technological Advancements
The late 19th and early 20th centuries witnessed a flurry of technological advancements, including the development of alternating-current (AC) technology, which enabled hydropower milestones in Oregon, Colorado, Croatia, Niagara Falls, and Japan. The rivalry between Thomas Edison and Nikola Tesla, known as the "War of the Currents," led to engineering feats such as powering Buffalo, New York, with energy from Niagara Falls. The 20th century brought further innovations, such as the first electronic television systems, the advent of stereo sound, and the widespread adoption of electronic devices and transistors.
Nuclear Ambitions and Challenges
The 1970s saw a wave of nuclear construction projects in the U.S., but this momentum was halted by slower electricity demand growth, construction delays, regulatory hurdles, and cost overruns. Nuclear power has also faced setbacks due to major accidents, including the Three Mile Island incident in 1979 and the Chernobyl disaster in 1986. Despite these challenges, the U.S. has become a leader in operating commercial reactors, with 112 units as of 1991.
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Frequently asked questions
An electrical system is a network of electrical components that allows for the transportation of electrical energy for a particular purpose.
The three fundamental components of an electrical system are resistors, capacitors, and inductors. Other components include motors, transformers, wires, and transistors.
The two quantities that are always seen across any type of electrical system are current and voltage. Current is the rate at which electric charge flows through a given area, while voltage is the difference in electrical potential between two points.
Examples of electrical systems include smartphones, computers, televisions, and electrical power grids.
Modern electrical systems in homes have evolved to prioritize safety, energy efficiency, and cost savings. For example, older homes may have aluminum wiring, which can pose a fire risk due to its tendency to expand and contract. In contrast, modern homes typically have grounded outlets and circuit breakers that enhance safety and reliability.
