what voltage comes out of a wall outlet
120 V
title: Open-circuit voltage text: Open-circuit voltage Open-circuit voltage (abbreviated as OCV or V ) is the difference of electrical potential between two terminals of a device when disconnected from any circuit. There is no external load connected. No external electric current flows between the terminals. Alternatively, the open-circuit voltage may be thought of as the voltage that must be applied to a solar cell or a battery to stop the current. It is sometimes given the symbol V. In network analysis this voltage is also known as the Thévenin voltage. The open-circuit voltages of batteries and solar cells are often quoted under particular conditions title: Power supply text: a power supply located in the load's AC power cord that plugs into a wall outlet; a "wall wart" is an external supply integrated with the outlet plug itself. These are popular in consumer electronics because of their safety; the hazardous 120 or 240 volt mains current is transformed down to a safer voltage before it enters the appliance body. Power supplies can be broadly divided into "linear" and "switching" types. Linear power converters process the input power directly, with all active power conversion components operating in their linear operating regions. In switching power converters, the input power is converted title: High voltage text: distinguish it from low voltage (50 to 1000 VAC or 120–1500 VDC) and extralow voltage (<50 VAC or <120 VDC) circuits. This is in the context of building wiring and the safety of electrical apparatus. In the United States 2011 National Electrical Code (NEC) is the standard regulating most electrical installations. There are no definitions relating to "high voltage". The NEC covers voltages 600 volts and less and that over 600 volts. The National Electrical Manufacturer's Association (NEMA) defines high voltage as over 100 to 230 kV. British Standard BS 7671:2008 defines "high voltage" as any voltage difference between conductors title: Mains electricity text: Mains electricity Mains electricity (as it is known in the UK and Canada; US terms include grid power, wall power, and domestic power) is the general-purpose alternating-current (AC) electric power supply. It is the form of electrical power that is delivered to homes and businesses, and it is the form of electrical power that consumers use when they plug domestic appliances, televisions and electric lamps into wall outlets. The two principal properties of the electric power supply, voltage and frequency, differ between regions. A voltage of (nominally) 230 V and a frequency of 50 Hz is used in Europe, most title: HT (vacuum tube) text: HT (vacuum tube) In vacuum tube technology, HT or high tension describes the main power supply to the circuit, which produces the current between anode and cathode. It is also known as the plate supply or voltage, B battery supply, or simply labeled ->B on circuit diagrams, from the days of battery powered circuitry. The HT supply circuit most commonly provides a positive voltage of some hundreds of volts to the anode (or "plate") and in later circuits also to the screen grid, with the cathode running at near ground or chassis potential. The main exception to this was in