Wiktor Wise
Computers are machines that can be programmed to automatically perform sequences of arithmetic or logical operations. They are considered electronic devices rather than electrical devices because they are composed of electronic parts and rely on electricity to function. Electrical devices exchange electrical energy into other forms of energy, such as heat, light, or sound, while electronic devices regulate the flow of electrons to carry out a task. Computers use digital circuits based on discrete voltage levels and a binary system to generate binary states. They are constructed with electronic parts such as transistors, valves (radio tubes), and integrated circuits. The distinction between electrical and electronic devices is important as it highlights the different ways in which energy is transformed and used to perform various tasks.
| Characteristics | Values |
|---|---|
| Definition of an electrical device | Electrical devices exchange electrical energy into other forms of energy, such as heat, light, or sound. |
| Definition of an electronic device | Electronic devices regulate the flow of electrons to carry out a task. |
| Composition of a computer | Computers are composed of electronic parts and rely on electricity to function. |
| Examples of electronic parts in computers | Transistors, valves (radio tubes), MOSFETs, integrated circuits, semiconductors. |
| Examples of electrical parts | Relays, motors, lightbulbs, switches, and batteries. |
| Computer capabilities | Computers can manipulate information or data, save, retrieve, and analyze information, access the Internet, send emails, type documents, and play games. |
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What You'll Learn
- Computers are electronic devices that rely on electricity to function
- Computers have electronic parts like transistors and valves
- Electrical devices convert electrical energy into other forms of energy, like heat, light or sound
- Electronics regulate the flow of electrons to carry out tasks
- Computers are programmable machines that perform arithmetic and logical operations
Computers are electronic devices that rely on electricity to function
The distinction between electrical and electronic devices lies in their functionality. Electrical devices convert electrical energy into other forms of energy, such as heat, light, or sound. On the other hand, electronic devices, like computers, use active semiconductors and transistors to control the flow of electrons, enabling them to process data according to programmed instructions.
The evolution of computers from mechanical devices to electronic ones began during World War II with the development of the first digital electronic calculating machines. The early machines used thermionic valves, but the introduction of semiconductor transistors in the late 1940s marked a significant shift. Transistors revolutionized computing by allowing for more compact and efficient designs, leading to the microprocessor and microcomputer revolution in the 1970s.
Modern digital electronic computers, as we know them today, are capable of executing a wide range of tasks through the use of programs. These programs are sets of generic operations that enable computers to process and manipulate data according to specific instructions. The internal memory of a computer temporarily stores data, instructions, and intermediate results until they are sent to output devices.
The design of electronic devices, including computers, involves addressing complex issues and ensuring proper functionality, service life, and disposal. Laboratory experimentation plays a crucial role in testing and verifying the designs, as well as detecting and correcting any faults. Electronic systems design covers a broad spectrum, from the initial design and development to ensuring the device meets the specified requirements of the user.
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Computers have electronic parts like transistors and valves
Computers are considered electronic devices because they contain electronic parts and rely on electricity to function. They are composed of active semiconductors, such as transistors, which are typically found in integrated circuit form. Transistors are the active components of integrated circuits, or "microchips," which often contain billions of minuscule devices etched into their surfaces. They are deeply embedded in almost everything electronic and are considered the nerve cells of the Information Age.
Transistors have three electrical leads: the emitter, the collector, and the base. In modern switching applications, these are known as the source, the drain, and the gate. A voltage source like a battery drives the current, while the rate of current flow through the transistor is governed by an input signal at the gate—much like how a faucet valve regulates water flow through a hose. Transistors operate as switches or gates for electronic signals, opening and closing an electronic gate many times per second. If a current flows, the circuit is on; if not, it's off. These two states correspond to the binary 1s and 0s used in digital computers.
The first semiconductor transistors were developed in the late 1940s, followed by the silicon-based MOSFET (metal-oxide-silicon field-effect transistor) in the late 1950s. The MOSFET enabled the creation of high-density integrated circuits and the development of MOS semiconductor memory, which replaced magnetic-core memory in computers. It is now the most widely used transistor in computers and the fundamental building block of digital electronics.
Before the advent of transistors, early electronic digital programmable computers like the Colossus and ENIAC used a large number of valves (vacuum tubes) to amplify weak electrical signals and produce audible sounds. These valves were replaced by transistors due to their smaller size, lower power consumption, higher reliability, and faster switching speeds.
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Electrical devices convert electrical energy into other forms of energy, like heat, light or sound
Electrical devices are those that convert electrical energy into other forms of energy, such as heat, light, or sound. A division of electrics is electronics, which contain active parts like transistors or valves (radio tubes). Computers are composed of these electronic parts and rely on electricity to function, so they are referred to as electronic devices.
A computer cannot perform any helpful task independently as it operates on data and instructions provided by a user. It is a device that takes data as input and modifies it through a set of specific instructions known as programs to produce the intended output. Computers are used to manipulate information or data, which can be saved, retrieved, and analyzed.
Examples of electrical devices that convert electrical energy into other forms include lightbulbs, ovens, toasters, alarm clocks, televisions, and hair dryers. Lightbulbs convert electrical energy into light and heat energy. Ovens, toasters, and hair dryers convert electrical energy into heat energy. Alarm clocks and televisions convert electrical energy into light and sound energy.
In summary, computers are considered electronic devices because they are composed of electronic parts and rely on electricity to function. They are not considered electrical devices because they do not directly convert electrical energy into other forms of energy like the examples of electrical devices mentioned above.
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Electronics regulate the flow of electrons to carry out tasks
In a conductive material, the outer electrons in each atom are free to move, and as each electron moves, it pushes the one ahead of it, resulting in a group movement. The starting and stopping of this electron flow is instantaneous, even if the motion of each electron is slow. This is comparable to a tube filled with marbles, where inserting a marble at one end causes another marble to exit from the other end immediately.
To direct the flow of electrons, a proper path must be provided, just like how a plumber installs pipes to control water flow. This path is created using conductive materials, ensuring a continuous path for electrons to travel through.
Electronic devices, such as computers, regulate the flow of electrons to perform tasks. Computers are considered electronic devices as they are composed of electronic parts, including active semiconductors like transistors, and rely on electric energy to function. They take data as input, modify it according to specific instructions or programs, and produce an intended output. The internal memory of a computer temporarily stores data, instructions, and intermediate results until they are sent to recipients through output devices.
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Computers are programmable machines that perform arithmetic and logical operations
Computers are machines that can be programmed to automatically perform sequences of arithmetic or logical operations. They are electronic devices that transform raw data and output information. Computers are composed of electronic parts and rely on electricity to function. They are controlled by programming and can store data in their memory.
The modern definition of a computer is: "A device that computes, especially a programmable [usually] electronic machine that performs high-speed mathematical or logical operations or that assembles, stores, correlates, or otherwise processes information." Any device that processes information can be considered a computer.
The CPU, or Central Processing Unit, is responsible for almost all operations performed by a computer system. The Arithmetic and Logical Unit (ALU) is a component of the CPU that carries out arithmetic and logic operations. The ALU can perform addition, subtraction, multiplication, division, and other numerical calculations. It can also handle boolean comparisons, returning true or false values.
Early mechanical computing machines date back to Archimedes' time, with the Antikythera mechanism. However, the 1930s and 1940s are considered the beginning of the modern computer era. During World War II, the British built the Colossus, the world's first electronic digital programmable computer, to aid in breaking German military communications. The ENIAC computer, developed in the 1940s, could be programmed to perform complex sequences of operations.
Today, computers are used in a wide range of industrial and consumer products, from simple special-purpose devices like microwave ovens to general-purpose devices like personal computers and smartphones.
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Frequently asked questions
A computer is an electronic device because it is composed of electronic parts and relies on electricity to function. Electrical devices, on the other hand, exchange electrical energy for other forms of energy, such as heat, light, or sound.
Electrical circuits include passive parts like relays, motors, lightbulbs, switches, and batteries.
Electronic devices contain active parts like transistors or valves (radio tubes).
Modern computers are digital electronic computers that can perform generic sets of operations known as programs. Examples include personal computers and mobile devices like smartphones.
Electronics engineers can design circuits with pre-manufactured building blocks like semiconductors and integrated circuits. Electronic devices can also regulate the flow of electrons to carry out tasks, allowing for more precise control and a broader range of functions.
