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A terminal is the point at which a conductor from a component, device or network comes to an end.^[1] Terminal may also refer to an electrical connector at this endpoint, acting as the reusable interface to a conductor and creating a point where external circuits can be connected.^[2]^[3] A terminal may simply be the end of a wire or it may be fitted with a connector or fastener.^{[citation needed]}

In network analysis, terminal means a point at which connections can be made to a network in theory and does not necessarily refer to any physical object. In this context, especially in older documents, it is sometimes called a pole. On circuit diagrams, terminals for external connections are denoted by empty circles.^[4] They are distinguished from nodes or junctions which are entirely internal to the circuit and are denoted by solid circles.^[5]

All electrochemical cells have two terminals (electrodes) which are referred to as the anode and cathode or positive (+) and negative (–). On many dry batteries, the positive terminal (cathode) is a protruding metal cap, and the negative terminal (anode) is a flat metal disc (see Battery terminal). In a galvanic cell such as a common AA battery, electrons flow from the negative terminal to the positive terminal, while the conventional current is opposite to this.^[6]

Types of terminals

Connectors
Line splices
Terminal strip, also known as a tag board or tag strip
Solder cups or buckets
Wire wrap connections (wire to board)
Crimp terminals (ring, spade, fork, bullet, blade)
Turret terminals for surface-mount circuits
Crocodile clips
Screw terminals and terminal blocks
Wire nuts, a type of twist-on wire connector
Leads on electronic components
Battery terminals, often using screws or springs
Electrical polarity

References

^ Davis, Larry (4 January 2012). "Definitions of Technical Terms - 'T' to 'Ter'". Electronic Engineering Dictionary. Retrieved 1 July 2019.
^ Connectors - Technologies and Trends (PDF). ZVEI - German Electrical and Electronic Manufacturers’ Association. August 2016. p. 51.
^ Barach, John. "Terminal definition by Babylon's free dictionary". Babylon NG. terminal n 2. Archived from the original on 1 July 2019.
^ "Circuit Symbols for Wires, Cables, Switches, Connectors". Electronics Notes. Retrieved 1 July 2019.
^ Electronics Symbols Handbook (PDF). Cleveland Institute of Electronics. p. 6. Retrieved 1 July 2019.
^ "An introduction to redox equilibria". Chemguide. Retrieved 4 July 2019.