The volt (symbol: V), named after Alessandro Volta, is the unit of measurement of electric potential, electric potential difference (voltage), and electromotive force in the International System of Units (SI).
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In this Dossier
Volts in the context of Metal–oxide–semiconductor
In electronics, the metal–oxide–semiconductor field-effect transistor (MOSFET, MOS-FET, MOS FET, or MOS transistor) is a type of field-effect transistor (FET), most commonly fabricated by the controlled oxidation of silicon. It has an insulated gate, the voltage of which determines the conductivity of the device. This ability to change conductivity with the amount of applied voltage can be used for amplifying or switching electronic signals. The term metal–insulator–semiconductor field-effect transistor (MISFET) is almost synonymous with MOSFET. Another near-synonym is insulated-gate field-effect transistor (IGFET).
The main advantage of a MOSFET is that it requires almost no input current to control the load current under steady-state or low-frequency conditions, especially compared to bipolar junction transistors (BJTs). However, at high frequencies or when switching rapidly, a MOSFET may require significant current to charge and discharge its gate capacitance. In an enhancement mode MOSFET, voltage applied to the gate terminal increases the conductivity of the device. In depletion mode transistors, voltage applied at the gate reduces the conductivity.
Volts in the context of Monte Ceneri Rail Tunnel
The Monte Ceneri Rail Tunnel is a railway tunnel in the Swiss canton of Ticino. The tunnel is situated under the Monte Ceneri Pass that separates the north of the canton around Bellinzona from the south of the canton around Lugano. It forms part of the Swiss Federal Railways Gotthard line, between Giubiasco and Rivera-Bironico stations. The tunnel comprises two bores, built at different times. The first bore, sometimes known as Monte Ceneri I, was opened on 10 April 1882 and is 1,675 metres (5,495 ft) in length. The second bore, Monte Ceneri II, was opened on 18 October 1933 and is 1,692 metres (5,551 ft) in length. Both bores carry a single standard gauge (1,435 mm or 4 ft 8+1⁄2 in) track electrified at 15 kV AC 16 2/3 Hz using overhead catenary.
The rail tunnel is paralleled by the Monte Ceneri Road Tunnel, carrying the A2 motorway under the same pass. The Ceneri Base Tunnel has recently been completed beneath the pass at a much lower level.