Trystan Casey
An electric circuit is a path for transmitting electric current. It is a collection of elements designed to carry electric current in a specific direction. Electronic circuits are a type of electrical circuit composed of individual electronic components such as resistors, transistors, capacitors, inductors, and diodes, connected by conductive wires or traces. The design process for digital circuits differs from analog circuits, with digital circuits being more complex and facing issues such as time delay and power dissipation. Electric circuits are used in our daily lives, such as in our homes, neighbourhoods, and electronic devices.
| Characteristics | Values |
|---|---|
| Definition | A path for transmitting electric current. |
| Components | A power source (e.g. battery), conductors, switch, load (e.g. light bulb), and connecting wires. |
| Types | Series circuit, parallel circuit, direct-current (DC) circuit, alternating-current (AC) circuit, analog circuit, digital circuit, mixed-signal circuit. |
| Function | Allows various operations such as signal amplification, computation, and data transfer. |
| Uses | Found in household appliances, electronic devices, and large-scale industries. |
| Safety | Can be dangerous and cause electrical fires if not handled properly. |
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What You'll Learn
- Electric circuits are a collection of elements designed to carry electric current in a specific direction
- They are made up of components like resistors, transistors, capacitors, inductors, diodes, and wires
- Circuits can be analog, digital, or mixed-signal (a combination of both)
- They can be used to amplify signals, perform computations, and move data
- Electric circuits can be closed or open, with the former allowing current to flow and the latter preventing it
Electric circuits are a collection of elements designed to carry electric current in a specific direction
The power source is usually a dry cell or a series of dry cells commonly called a battery. It is connected to a load or a device, which can be a light bulb, a resistor, a heater, etc. The load is also known as the resistor. Conductors are made of copper wires with no insulation. One end of the wire is connected to the load and the power source, and the other end connects the power source back to the load. A switch is a small gap in the circuit, and it can be used to open or close a circuit.
Electric circuits are classified into two types based on the direction of the flow of current: direct current (DC) and alternating current (AC) circuits. A direct-current circuit carries current that flows only in one direction, while an alternating-current circuit carries current that pulsates back and forth many times each second, as in most household circuits. A series circuit comprises a single path along which the whole current flows through each component, and a parallel circuit comprises branches so that the current divides and only part of it flows through any branch.
In a home electrical circuit, for instance, the same voltage is applied across each light or appliance, but each of these loads draws a different amount of current, according to its power requirements. Electric circuits are an integral part of day-to-day life, from simple battery-powered devices to large-scale industries and businesses.
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They are made up of components like resistors, transistors, capacitors, inductors, diodes, and wires
Electric circuits are made up of various components, including resistors, transistors, capacitors, inductors, diodes, and wires. These components work together to transmit and control electric current.
Resistors
Resistors are circuit components designed to offer a specific amount of resistance to the flow of electric current. They are commonly composed of various compounds and forms, with their electrical function specified by their resistance value. Resistors can be implemented within integrated circuits and are characterised by their series inductance and parallel capacitance. They are often used in high-frequency applications and power electronics, where their maximum power rating must be considered to prevent incineration.
Transistors
Transistors are semiconductor devices that play a crucial role in modern electronics. They are used to amplify or switch electrical signals and power. Transistors consist of semiconductor material and typically have at least three terminals for connection to an electronic circuit. By applying voltage or current to one pair of terminals, the current through another pair of terminals can be controlled. Transistors are essential in logic gates and microprocessors, contributing to their low cost, flexibility, and reliability.
Capacitors
Capacitors are circuit elements that store electric charge and energy. They consist of two conductive plates separated by an insulating material called a dielectric. The capacitance of a capacitor, measured in farads, depends on the overlapping surface area of the plates and the distance between them. When positive and negative charges accumulate on the plates, the capacitor becomes charged and can hold its charge due to the attraction between the opposite charges. Capacitors are commonly used in tuning circuits and energy storage applications.
Inductors
Inductors are passive circuit components characterised by their ability to oppose changes in current flowing through them. When the current flowing through an inductor changes, it induces a voltage with a polarity that opposes the change in current, as described by Faraday's law of induction and Lenz's law. Inductors are commonly used in alternating current (AC) equipment, particularly in radio equipment, to block AC while allowing direct current (DC) to pass. They are also utilised in electronic filters and tuned circuits for radio and TV receivers.
Diodes
Diodes are semiconductor devices that allow current to flow easily in one direction while blocking it in the reverse direction. When the voltage across the diode reaches the breakdown voltage, its high resistance to reverse current suddenly drops. Diodes are used for voltage regulation and protecting circuits from high-voltage surges. They are commonly employed in rectifier applications, radio and TV tuning, and light emission, such as light-emitting diodes (LEDs).
Wires
Wires are essential components in electric circuits, providing a path of low resistance for the flow of electrons from a power source to electrical devices or appliances. They are typically made of conductive materials like copper and are insulated with polyvinyl chloride (PVC) coatings to improve efficiency and protect against shocks. Wires are colour-coded to indicate their function and potential dangers. For example, red and black indicate live wires, white denotes a neutral wire, and green or bare wires are ground/earth wires.
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Circuits can be analog, digital, or mixed-signal (a combination of both)
An electric circuit is a closed-loop or path that forms a network of electrical components, where electrons can flow. It is a never-ending looped pathway for charge carriers. A simple electric circuit comprises a power source, conductors, a switch, and a load.
Electric circuits can be analog, digital, or mixed-signal. Analog circuits use a continuous time-varying signal, while digital circuits use a non-continuous signal that takes on only a finite number of values. For example, a light bulb that lights up when a circuit is turned on is a load or resistor.
Analog circuits form the foundation for digital circuits as they respond to continuously varying stimuli. They are also the basis for circuits that sense the external conditions of an IC, such as ambient temperature, air pressure, motion, and light. This is fundamental to many Internet of Things (IoT) devices, such as machine vision, which is based on sensing light.
Digital circuits, on the other hand, simplify the analysis of large numbers of devices by modelling the propagation of discrete "ones and zeros".
Mixed-signal circuits contain both analog and digital circuitry, allowing for the conversion of signals between the two formats. This integration offers tremendous flexibility in design and development, providing advantages in data acquisition, storage, and transmission. However, it also presents challenges, as designers must carefully balance the needs and operational requirements of both analog and digital systems to ensure optimal performance and signal integrity.
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They can be used to amplify signals, perform computations, and move data
An electric circuit is a path for transmitting electric current. It includes a device that gives energy to the charged particles constituting the current, such as a battery or generator; devices that use this current, such as lamps, electric motors, or computers; and the connecting wires or transmission lines.
Electric circuits can be used to amplify signals, perform computations, and move data. Amplifiers are a type of electronic circuit that can amplify small input voltage signals or switch heavy load currents. They are commonly used to drive loudspeakers or feed motors. Amplifiers can be categorised based on the size of the signal, its physical configuration, and how it processes the input signal. The classification also depends on the portion of the input signal in which the output transistor conducts, as well as the efficiency and power consumption of the amplifier.
Amplifiers can be further divided into two types: Small Signal Amplifiers and Large Signal Amplifiers. Small Signal Amplifiers amplify very small signal voltage levels of only a few microvolts, while Large Signal Amplifiers amplify large input voltage signals. The difference between the input and output signals is known as the Gain of the amplifier, which is a measure of how much the input signal is amplified.
Electric circuits can also perform computations. Digital electronic circuits, for example, use electric signals to represent logical and numeric values. Binary encoding is commonly used, where one voltage represents a binary '1' and another voltage represents a binary '0'. Transistors are interconnected to create logic gates that provide the functions of Boolean logic, such as AND, NAND, OR, NOR, and XOR. These logic gates can be used to create general-purpose computing chips and custom-designed logic circuits.
Finally, electric circuits can move data from one place to another. When a signal propagates along a wire, it is the electromagnetic field between the wire and a nearby "ground" or "return" conductor that carries the signal. The data is encoded as voltage pulses or current pulses, which travel at a specific speed related to the wire's permittivity. This speed is typically about 70% of the speed of light.
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Electric circuits can be closed or open, with the former allowing current to flow and the latter preventing it
An electric circuit is a closed-loop or path that forms a network of electrical components, where electrons can flow. This path is made using electrical wires and is powered by a source, like a battery. The start of the point from where the electrons start flowing is called the source, and the point where electrons leave the electrical circuit is called the return.
A simple circuit comprises a power source, conductors, a switch, and a load. The power source is often a battery, which is connected to a load or device, such as a light bulb, a resistor, or a heater. The load is also known as the resistor. Conductors are made of copper wires with no insulation. One end of the wire is connected to the load and the power source, and the other end connects the power source back to the load. A switch is a small gap in the circuit, which can be used to open or close it.
A closed circuit is formed when current flows continuously in the circuit. This is also known as a complete circuit. A break in the circuit that stops the flow of current creates an open circuit. For example, in a series circuit, the current flows along a single path, so a break anywhere in the circuit will prevent the flow of electrons.
In an open circuit, the flow of electrons is prevented. This can be due to a break or switch in the circuit. In some cases, such as with water heaters, freezers, and refrigerators, an open circuit is used to control the temperature of the device. Once the desired temperature is reached, the circuit automatically opens and stops the flow of current.
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Frequently asked questions
An electric circuit is a path for transmitting electric current. It includes a device that gives energy to the charged particles constituting the current, such as a battery or a generator, devices that use current, such as lamps, electric motors, or computers, and the connecting wires or transmission lines.
Electric circuits can be categorised as either analog, digital, or mixed-signal (a combination of analog and digital).
The circuit used in your home is called a domestic circuit. It includes the electric power we receive in our houses (mains supply), cables, wires, and a fuse.
