Wiktor Wise
Computers are made up of many components, but at the most fundamental level, they are built on transistors, which act as microscopic switches. These transistors can be combined to create logic gates, which perform basic mathematical operations and other functions that are essential for a computer to work. When electricity enters a computer, it flows through transistors, producing an output current. The Core Processing Unit (CPU) controls the voltage of electricity through many tiny circuits. High voltage can be considered on or 1, while low voltage is off or 0. By combining these currents and circuits, logic gates are formed, which can take two inputs in the form of two currents of electricity. These logic gates can be manipulated by a switch, which controls which gate is used and which 1's and 0's are fed into its input. This allows the computer to perform various functions and display information on a screen in a form that humans can understand.
| Characteristics | Values |
|---|---|
| Electricity input | Flow of electrical charge |
| Electricity path | Through a piece of wire due to a difference in electric field potential at each end |
| Voltage | High or low |
| Binary | High voltage = 1, Low voltage = 0 |
| Logic gates | Basic mathematical operations |
| Switch | Controls which logic gate is used and which 1s and 0s to feed into its input |
| Transistors | Microscopic switches that produce output current |
| Clock circuit | Controls the sequence of pulses |
| Multi-input AND gate | Checks multiple inputs to see if they are all 1s |
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What You'll Learn
The role of the Core Processing Unit (CPU)
Electricity enters a computer via the power supply unit (PSU), which controls the distribution of electricity to the other components. One of these components is the Core Processing Unit (CPU), which acts as the computer's "'control center'" or "brain".
The CPU is a complex set of electronic circuitry that runs the machine's operating system and apps. It interprets, processes, and executes instructions from hardware and software programs. The CPU performs arithmetic, logic, and other operations to transform data input into more usable information output.
The CPU's principal components include the arithmetic-logic unit (ALU), which performs arithmetic and logic operations, processor registers, which supply operands to the ALU and store the results, and a control unit, which orchestrates the fetching, decoding, and execution of instructions by coordinating the operations of the ALU, registers, and other components.
The CPU also controls the voltage of electricity through many tiny circuits. High voltage can be considered "on" or "1", while low voltage is "off" or "0". By combining these currents and circuits, "logic gates" can be created, which can take two inputs (two currents of electricity) and determine whether to continue at high or low voltage.
Overall, the CPU is an essential component of a computer, handling every task the computer performs and making it possible to play, learn, and connect.
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Voltage control and logic gates
Computers use electricity to power logic gates, which are devices that perform Boolean functions, or logical operations, on binary inputs to produce single binary outputs. Logic gates are made from MOSFETs (metal–oxide–semiconductor field-effect transistors) and are designed to only input and output two types of signals: "high" (1) and "low" (0). These signals are represented by variable voltages, with full power supply voltage for "high" states and zero voltage for "low" states.
The Core Processing Unit (CPU) controls the voltage of electricity through many tiny circuits. High voltage can be considered "on" or "1", while low voltage means "off" or "0". By combining these currents and circuits, logic gates are created. Logic gates take two inputs, or two currents of electricity, and perform a logical operation on them. For example, an AND gate will only output a high voltage if both inputs are high.
Logic gates can be cascaded, allowing the construction of Boolean logic and algorithms. Compound logic gates such as AND-OR-Invert (AOI) and OR-AND-Invert (OAI) are commonly used in circuit design as they are simpler and more efficient than individual gates. Logic gates can be constructed using a variety of components, including vacuum tubes, electromagnetic relays, fluidic logic, pneumatic logic, optics, molecules, acoustics, and mechanical or thermal elements.
In reality, logic signal voltage levels rarely attain perfect voltage limits due to stray voltage drops in transistor circuitry. Logic gates have acceptable" input and output signal voltage ranges that they are designed to work with. For example, a TTL gate operates on a nominal power supply voltage of 5 volts, but can accept input signals ranging from 0 to 0.8 volts for a "low" logic state and 2 to 5 volts for a "high" logic state. If a voltage signal falls between these ranges, it is considered "uncertain", and the logic gate may not interpret it correctly.
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Transistors and switches
Transistors are semiconductor devices with at least three terminals for connection to an electric circuit. They are used to amplify or switch electrical signals and power. A small current at the base terminal, flowing between the base and the emitter, can control or switch a much larger current between the collector and emitter. This property is called gain. Transistors can also be used as electrically controlled switches, where the amount of current is determined by other circuit elements.
The first working transistor, a germanium-based point-contact transistor, was invented by John Bardeen and Walter Houser Brattain at Bell Labs in 1947. The introduction of the transistor is often considered one of the most important inventions in history. The development of high-power and high-voltage transistors at economical prices made it practical to introduce switched-mode supplies to desktop personal computers. All modern computers now use switched-mode power supplies, which are lighter, less costly, and more efficient than equivalent linear power supplies.
Transistors have two types: the bipolar junction transistor (BJT) and the field-effect transistor (FET). BJTs have terminals labelled base, collector, and emitter, while FETs have terminals labelled gate, source, and drain. A voltage at the gate of an FET can control a current between the source and drain. BJTs and FETs are used in different applications, with FETs offering advantages such as not requiring a continuous flow of drive current to remain in the "on" state, faster switching speeds, and lower switching power losses.
In a switching circuit, the goal is to simulate an ideal switch with the properties of an open circuit when off, a short circuit when on, and an instantaneous transition between the two states. In a grounded-emitter transistor circuit, as the base voltage rises, the emitter and collector currents rise exponentially, while the collector voltage drops due to reduced resistance from the collector to the emitter.
Switches are also important in power supplies, which are used to convert electric current from a source to the correct voltage, current, and frequency to power a load. Some power supplies have a manual switch for selecting input voltage, while others automatically adapt to the main voltage. Power supplies designed for worldwide use were once equipped with an input voltage selector switch that allowed the user to configure the unit for use on the local power grid.
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Binary and machine code
Binary code is a system of two numbers, 0 and 1, which represent off and on. These can be used to create programming languages that can be more easily manipulated. Binary code can be converted into machine code, which is a set of instructions for the computer to follow. These instructions are in the form of electrical signals, which are then interpreted and executed by the computer.
Machine code is a set of electrical signals represented by bytes of data, sets of 0s and 1s, in a memory device. It is a low-level programming language that is designed to be used directly by a computer's central processing unit (CPU). Machine code is not "converted" into electrical signals but is, in fact, a set of electrical signals. These electrical signals are processed by the computer's CPU, which interprets the signals as instructions to perform specific tasks.
The process of converting a program written in a high-level programming language, such as C++, into machine code involves several steps. Firstly, the program is compiled into machine code, which is then converted into electrical signals that the computer can execute. The compiler generates data that is stored in memory devices, and this data is then processed by the electrical system.
At the lowest level, the conversion between binary/machine code and electrical signals is done using transistors. For example, in NMOS logic, a NOR gate can be built to perform the state transition between 1 and 0 or 0 and 1.
It is important to note that the concept of binary and machine code is abstract, and the physical implementation involves manipulating voltages and currents. The electrical signals are then used to control various peripherals, such as video cards, RAM, hard drives, and sound cards.
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The role of software programmers
Software programmers play a crucial role in the process of converting electricity into input. They are responsible for creating the electric signals that turn transistors on and off by using their keyboards and mice. These input devices, along with various sensors, convert physical actions into electrical signals. Programmers decide on the constraints and write code that instructs the computer on how to respond to these electrical signals. This code serves as a set of pre-programmed switching orders that determine how the computer will react to user input.
The process of programming involves creating a complex state machine that takes the instruction register (machine code) as input to determine its course of action. Programmers use compilers to translate human-readable source code into machine code that the computer's processor can understand and execute. This compilation process is essential for the computer to interpret and respond to user input.
While programmers receive extensive training in programming languages and methodologies, there is often a lack of focus on software energy consumption and efficiency in their education. This gap in knowledge can lead to a disconnect between performance optimization and energy optimization. For example, while parallel processing can improve performance, it may also result in increased energy consumption due to additional processes involved.
To address this, there is a growing emphasis on educating programmers about energy-efficient computing practices. With the increasing popularity of mobile devices and cloud computing, reducing energy consumption has become a critical non-functional requirement for software development. Programmers are now being encouraged to consider energy consumption alongside other non-functional requirements such as memory usage, performance, security, and usability.
In conclusion, software programmers play a pivotal role in converting electricity into input through their programming skills. They create the electric signals, write code, and set the parameters for the computer to function. However, there is a recognized need to enhance their understanding of energy consumption to create more efficient software and computing practices.
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Frequently asked questions
Electricity is a flow of electrical charge. The computer turns electricity into input by controlling the distribution of electrical charge through its various components. One of the key components is the Core Processing Unit (CPU), which controls the voltage of electricity through many tiny circuits. High voltage is "on" or "1", and low voltage is "off" or "0". These currents and circuits create "logic gates", which perform basic mathematical operations and other functions required for a computer to operate.
Logic gates are created by combining currents and circuits. A simple example of a logic gate is "AND", which combines two inputs (currents of electricity). If both inputs are high voltage (1), then the output will also be high voltage. If either input is low voltage (0), then the output will be low voltage.
Software programmers write software that controls which logic gates are used and which 1's and 0's to feed into its input. The output is then converted into a form that humans can understand, such as a number on a screen.
