Molly Ayala
Electric circuits are closed-loop pathways that allow electrons to flow through them. They are made up of at least two parts: a voltage source, such as a battery, and a conductor, such as a wire. Other components include switches, which can break a circuit by diverting the current, and loads, which are electric components that convert electrical energy into other forms of energy, like light bulbs. Cells, which are devices with positive and negative terminals, can also be used as power sources. These basic components can be combined in different ways to create series or parallel circuits, allowing for a variety of applications, from lighting to electronic devices.
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What You'll Learn
Sources of power: cells, batteries, and voltage
The term "battery" was first used by Benjamin Franklin in 1749 during his experiments with electricity using a set of linked Leyden jar capacitors. However, the first electrochemical battery was built by Italian physicist Alessandro Volta in 1800. This battery, known as the voltaic pile, consisted of copper and zinc plates separated by brine-soaked paper disks, producing a steady current. Volta discovered that using different metals in the pile could increase the voltage.
The Daniell cell, invented by British chemist John Frederic Daniell in 1836, was the first practical source of electricity. It consisted of a copper pot filled with a copper sulfate solution, in which was immersed an unglazed earthenware container filled with sulfuric acid and a zinc electrode. These wet cells were fragile and prone to leakage, making them unsuitable for portable appliances.
Dry cells, such as the common zinc-carbon battery, offer improved safety and portability compared to early wet cells. They have a nominal voltage of 1.5 volts and are composed of a zinc anode and a carbon cathode, with an electrolyte of ammonium chloride.
The voltage of a cell is determined by the difference in standard potential between the electrodes, which equates to the force with which electrons travel between them. This is known as the cell's overall electrochemical potential. Higher voltage means more work can be done by the same number of electrons, resulting in increased power output from the battery.
Different combinations of metals in battery cells can produce varying voltage and current outputs. Some combinations deliver high voltage rapidly but cannot sustain it for long, while others produce a lower current that can be maintained for extended periods. Stacking multiple cells together can also increase the overall voltage of a battery.
Lithium-ion batteries offer several advantages over traditional lead-acid batteries, including higher power density, lighter weight, and shorter charging times. They can be charged at any time and do not exhibit the memory effect seen in nickel-cadmium batteries.
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Conductors: wires and switches
Conductors are materials that allow electricity to flow through them easily. Metals, in particular, are good conductors, which is why wires are usually made of copper or aluminium. Wires are essential in electronics as they connect different components together, allowing electrical current to flow between them and creating an electronic circuit.
In an electronic circuit, wires are used to connect components like resistors, capacitors, inductors, diodes, LEDs, transistors, crystals, and oscillators. These components have leads or terminals that the wires are connected to. The wires themselves are usually made of conductive metal, most commonly copper, but sometimes also aluminium or silver.
Switches are also an important part of electronic circuits. They are a type of electromechanical component, which means they use moving parts or electrical connections to carry out electrical operations. Switches, in particular, are used to control the flow of electricity in a circuit. When a switch is turned on, it completes the circuit, allowing current to flow. When it is turned off, the circuit is broken, and the current stops flowing.
In addition to their role in electronic circuits, wires also play a crucial part in electric motors. By coiling a wire around a rod and running electricity through it, a magnetic field is generated. This magnetic field has two poles, north and south, and exhibits basic magnetism where like poles repel each other. This principle is fundamental to how electric motors work, using electromagnetism to spin the motor as long as it receives a steady current.
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Loads: buzzers, light bulbs, and resistors
Buzzers, light bulbs, and resistors are all examples of loads in an electrical circuit. A load is a component that draws power from the circuit to perform a function, such as creating light or sound.
Light bulbs are a common type of load, converting electrical energy into light energy. When connected to a circuit, the filament inside the bulb, usually made of tungsten, emits light when an electric current passes through it. The brightness of the bulb depends on the current flowing through it, with higher currents resulting in a brighter light.
Buzzers are another type of load, producing sound when activated. They are often used in combination with light bulbs, especially in applications like alarms or doorbells, where both visual and audible indicators are needed. Buzzers typically have two wires of different polarities, with the red wire being the positive input and the black wire being the negative input.
Resistors are components that introduce resistance into the circuit, controlling the flow of current. They are often used in conjunction with light bulbs to limit the current and protect the bulb from excessive current that could cause it to burn out. In a series circuit, where components are connected end-to-end, resistors help distribute the voltage evenly across each component, ensuring that each bulb receives the same voltage and current.
The behaviour of loads in a circuit can vary depending on whether the circuit is a series or parallel circuit. In a series circuit, the current flows through each component in sequence, so any changes in resistance or voltage drop in one component will affect the others. In a parallel circuit, where components are linked across each other, each component receives the same voltage, but the current is divided among them. This means that adding more bulbs in parallel will not affect the brightness of the other bulbs, as each bulb draws the same voltage but only a portion of the total current.
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Circuit types: series and parallel
Electric circuits are made up of various components, including switches, loads (or resistors), and power sources (or cells). These circuits can be broadly categorized into two types: series and parallel.
Series Circuits
In a series circuit, all the components are connected end-to-end, forming a single path for the current to flow. Each component in a series circuit experiences the same current flowing through them, and the voltage across the circuit is the sum of the individual voltage drops across each component. This means that the total resistance in a series circuit is the sum of the individual resistances. Series circuits are also known as voltage dividers.
An example of a series circuit is a simple setup consisting of four light bulbs and a 12-volt automotive battery. If a wire joins the battery to one bulb, then to the next bulb, and so on, forming a continuous loop back to the battery, the bulbs are said to be in series. In this case, the same current flows through all the bulbs, and the voltage drop might be insufficient to make them glow brightly. Series circuits were formerly used for lighting in electric multiple unit trains.
Parallel Circuits
In contrast, a parallel circuit consists of components connected across each other, with each component having its own circuit or branch. While the voltage across each component in a parallel circuit remains the same, the total current is the sum of the currents flowing through each component, making them current dividers. Parallel circuits have at least two electrically common nodes, and the number of nodes does not increase with the addition of more components.
To continue with the previous example, if each light bulb in the circuit has its own connection to the battery, forming separate loops, the bulbs are then in parallel. In this configuration, the bulbs will glow as the voltage drop across each bulb is sufficient. Parallel circuits are advantageous when it is crucial for components to keep functioning even if one component fails.
Combination of Series and Parallel Circuits
Many circuits are not solely composed of series or parallel connections but are a combination of both. These hybrid circuits can be more complex and are designed to meet specific requirements.
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Circuit states: open and closed
Electric circuits can be in one of two states: open or closed. An open circuit is a broken path where no current can flow because one or more connections are broken, whereas a closed circuit is a continuous path that current is flowing through.
Open circuits are often unintentional and indicate a problem with the circuit. For example, a lightbulb that does not turn on may be due to an open circuit caused by a broken wire or a faulty switch. In contrast, closed circuits are generally intentional and indicate that a circuit is functioning as intended.
A closed circuit allows electricity to flow from the power source to the load (the device being powered) and back to the power source. This flow of electricity is called the current. The load could be a lightbulb, a motor, or any other electrical device.
For a closed circuit to function, it must have a power source, such as a battery or a generator. The power source provides the electrical energy needed to power the load. The circuit must also have a conductive path for the electricity to flow from the power source to the load. This path is typically made of copper or aluminium wire, which has a low resistance to electrical flow.
A closed circuit can be opened by interrupting the flow of electricity, such as by turning off a switch or unplugging a device. This breaks the conductive path and stops the flow of electricity. Opening a circuit is important for safety, as it can prevent electrical shocks or fires.
In summary, the state of an electric circuit determines whether or not current can flow. An open circuit is broken and non-functional, while a closed circuit is continuous and allows current to flow from the power source to the load. Understanding the difference between these two states is essential for working with electrical systems safely and effectively.
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Frequently asked questions
All electric circuits have at least two parts: a voltage source (like a battery) and a conductor (like a wire). They may also include other parts, such as light bulbs and switches.
A voltage source is the power source of an electric circuit. Examples include cells and batteries.
A conductor is a material that allows electric current to flow through it. Wires are conductors and are usually made of good conducting metals such as copper.
A switch is a device that can break an electrical circuit by diverting the current from a conductor to another conductor or an insulator.
A load is an electrical component that converts electrical energy into other forms of energy, such as a light bulb or a buzzer.
