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The ampere-turn (symbol A⋅t) is the MKS (metre–kilogram–second) unit of magnetomotive force (MMF), represented by a direct current of one ampere flowing in a single-turn loop. [1] Turns refers to the winding number of an electrical conductor composing an electromagnetic coil .
Signal lights may refer to: Traffic light, signal lights controlling automotive & pedestrian traffic flow; Turn signals, signal lights indicating automotive change of direction; Railway signalling, use of signal lights to control train traffic flow; Signal lamp, a device for communicating between ships with flashing lights.
Modern signal lamps can produce a focused pulse of light. In large versions, this pulse is achieved by opening and closing shutters mounted in front of the lamp, either via a manually operated pressure switch, or, in later versions, automatically. With hand-held lamps, a concave mirror is tilted by a trigger to focus the light into pulses.
A type of signal generator that can generate almost any waveform. arc converter A device once used to generate radio waves. arc furnace A furnace that melts material by use of an electric arc. arc lamp An electric lamp that generates light from an electric arc. arc welder A device used to join metals by melting them with an electric arc. armature
Common light-emitting diode (constant current); also deadly limit for skin contact (at 120–230 V) 80 mA Upper limit for TENS modeled for 500 Ω [3] 10 −1: 150 mA 230 V AC, 22-inch/56-centimeter portable television (35 W) 166 mA Typical 12 V motor vehicle instrument panel light 250 – 450mA: 230 V AC Tungsten incandescent light bulb (60 ...
The ampere is an SI base unit and electric current is a base quantity in the International System of Quantities (ISQ). [ 4 ] : 15 Electric current is also known as amperage and is measured using a device called an ammeter .