A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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Be sure to use the Arduino Stack Exchange for questions that are more Arduino and less electronics.
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A device which includes a central processing unit (CPU), memory, and (generally) an assortment of I/O peripherals (UART, ADC, DAC, general-purpose I/O, I2C, etc.) in a tightly-coupled standalone packa…
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An electronic device which supplies electrical energy to a load. Can be AC or DC input. Typically DC output.
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a light-emitting diode. Lighting an LED is considered the "Hello world" of a circuit design, and it can be as simple as putting a series resistor or can get more complicated, involving PWM a…
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Voltage, otherwise known as electrical potential difference (denoted ∆V and measured in volts) is the difference in electric potential between two points (adapted from Wikipedia). Voltage can be const…
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a primary concern for the design under discussion. Use the "low-power" tag when that applies.
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a semiconductor device that can amplify signals and switch power. Most used types are bipolar (BJT, for Bipolar Junction Transistor) and MOSFET (FET, for Field Effect Transistor)
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a brand of 8, 16, and 32 bit RISC microcontrollers manufactured by Microchip. "PIC" originally was an acronym for "Peripheral Interface Controller".
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nearly useless. Consider using more specific tags to narrow your question down.
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a device consisting of one or more electrochemical cells that convert stored chemical energy into electrical energy
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a high gain analog voltage amplifier with differential high impedance inputs, and a low impedance output. A basic building block in signal processing, like as ampl…
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A fundamental electronic component that stores energy in an electric field, commonly used in filtering applications.
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the acronym to Printed Circuit Board. A PCB is a carrier for the circuit's components and their electrical connections.
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Digital electronics use a finite number of states, unlike analog electronics that treat continuous signals. Digital logic is used to perform arithmetic operations with electric signals, and constitute…
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Flow of electric charge - typically movement of charge carriers, such as electrons. Measured in amperes (A).
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An transconductance (using voltage to control current) electronic component used for switching and amplification. Acronym for Metal-Oxide-Semiconductor Field-Effect Transistor. (from http://en.wikiped…
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Universal Serial Bus. If your question relates to a specific chip, please mention it in your question.
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Sensors convert a physical quantity (e.g. temperature, pressure) into an electrical signal.
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a 8- and 32-bit microcontroller core developed by Atmel. AVR was chosen as microcontroller for the popular Arduino SBCs.
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A resistor obeys Ohm's law (V=IR); the current through it is equal to the voltage across it divided by the resistance (equivalently \$I=\frac{V}{R}\$)
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adapt the range of the signal to a requirement, to make it more robust for transmission, or to satisfy interface requirement (like input/output impedance)
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a logic chip that is configured by the customer after manufacturing—hence "field-programmable".
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Short for Radio-Frequency. Frequencies at which radiation (intentional or not) plays a role. Typically associated with wireless communications, but also relevant for high-speed PCB design.
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an analog circuit that produces a stable output voltage that doesn't vary with input voltage or load changes. Switching regulators are much more efficient than linear ones.
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Questions about designing electronics for measuring, processing, and amplifying audio signals.
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An electrical actuator converting electrical energy into rotational motion.
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Devices to interrupt or route a signal or power one of several ways.
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an Analog to Digital Converter. This device converts analog signals into digital form. It is mainly used by the digital circuitry to take analog measurements.
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an electrically controlled switch. Electromechanical relays use an electromagnet to activate mechanical contacts, solid-state relays use semiconductor switches.
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an electronic circuit built onto a single plate of a semiconductor material, normally silicon. Modern ICs may contain billions of transistors and they have played a major…
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refers to alternating current mains power. It usually applies to voltages with >100V RMS, but can also be used for ex. 24V industrial AC power.
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About designing the boards which carry the components of an electronic circuit. For questions about getting them built instead use PCB-fabrication. If your question is specific to a certain CAD tool, …
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A transformer couples two or more AC signals through a magnetic field. Often used as galvanic isolation and to transform one AC voltage to another.
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semiconductor components made from a P-type and N-type silicon material, that allows current to only flow in one direction.
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DC stands for Direct Current, which means the flow of electric charge in a single direction. Examples of a DC source are batteries, solar panels, dynamos.
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Analog circuits have a range of voltages, rather than just two as in digital logic.