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Even though the two electric lines (and respective tariffs) were gradually unified beginning in the 1960s (the official, but purely theoretical, date was the summer of 1974) [44] many houses had dual wiring and two electricity meters for years thereafter; in some zones of Lazio the 127 V network was provided for lighting until 1999.
The maximum length for a cable segment is 100 meters (330 ft) per TIA/EIA 568-5-A. [31] If longer runs are required, the use of active hardware such as a repeater or switch is necessary. [32] [33] The specifications for 10BASE-T networking specify a 100-meter length between active devices. [34]
A photovoltaic system, also called a PV system or solar power system, is an electric power system designed to supply usable solar power by means of photovoltaics.It consists of an arrangement of several components, including solar panels to absorb and convert sunlight into electricity, a solar inverter to convert the output from direct to alternating current, as well as mounting, cabling, and ...
For example, if the meter is set to a range of 300 V full scale, the meter's impedance will be 6 MΩ. 20,000 Ω/V is the best (highest) sensitivity available for typical analog multimeters that lack internal amplifiers. For meters that do have internal amplifiers (VTVMs, FETVMs, etc.), the input impedance is fixed by the amplifier circuit.
Luminous efficacy is measured in lumens per watt (lm/W). The luminous efficiency of a source is defined as the ratio of its luminous efficacy to the maximum possible luminous efficacy, which is 683 lm/W. [ 80 ] [ 81 ] An ideal white light source could produce about 250 lumens per watt, corresponding to a luminous efficiency of 37%.
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They often appeared next to a 3.5 mm microphone jack for a remote control on-off switch on early portable tape recorders; the microphone provided with such machines had the on-off switch and used a two-pronged connector with both the 3.5 and 2.5 mm plugs. They were also used for low-voltage DC power input from wall adapters.
Luminous blue variable stars can undergo "giant outbursts" with dramatically increased mass loss and luminosity. η Carinae is the prototypical example, [19] with P Cygni showing one or more similar outbursts 300–400 years ago, [20] but dozens have now been catalogued in external galaxies.