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2. Siemens (unit) - Wikipedia

   en.wikipedia.org/wiki/Siemens_(unit)

   The siemens (symbol: S) is the unit of electric conductance, electric susceptance, and electric admittance in the International System of Units (SI). Conductance, susceptance, and admittance are the reciprocals of resistance, reactance, and impedance respectively; hence one siemens is equal to the reciprocal of one ohm (Ω −1) and is also referred to as the mho.

3. Orders of magnitude (current) - Wikipedia

   en.wikipedia.org/wiki/Orders_of_magnitude_(current)

   230 V AC Tungsten incandescent light bulb (60–100 W) 290 mA 120 V AC, 22-inch/56-centimeter portable television (35 W) 500 – 830 mA 120 V AC Tungsten incandescent light bulb (60–100 W) 10 0: 1 A Typical iPhone charger (5 W) 1.35 A Tesla coil, 0.76 meters (2 ft 6 in) high, at 200 kV and 270 kV peak [4] 2.1 A High power LED current (peak 2. ...

4. Electrical resistance and conductance - Wikipedia

   en.wikipedia.org/wiki/Electrical_resistance_and...

   where is the length of the conductor, measured in metres (m), A is the cross-sectional area of the conductor measured in square metres (m 2), σ is the electrical conductivity measured in siemens per meter (S·m −1), and ρ is the electrical resistivity (also called specific electrical resistance) of the material, measured in ohm-metres (Ω ...

5. List of SI electromagnetism units - Wikipedia

   en.wikipedia.org/wiki/List_of_SI...

   Symbol [1] Name of quantity Unit name Symbol Base units E energy: joule: J = C⋅V = W⋅s kg⋅m 2 ⋅s −2: Q electric charge: coulomb: C A⋅s I electric current: ampere

6. Mains electricity - Wikipedia

   en.wikipedia.org/wiki/Mains_electricity

   A 50 Hz ±5 Hz vibrating-reed mains frequency meter for 220 V. The world's first public electricity supply was a water wheel driven system constructed in the small English town of Godalming in 1881. It was an alternating current (AC) system using a Siemens alternator supplying power for both street lights and consumers at two voltages, 250 V ...

7. Class of accuracy in electrical measurements - Wikipedia

   en.wikipedia.org/wiki/Class_of_accuracy_in...

   In electrical engineering, characteristics like current or voltage can be measured by an ammeter, a voltmeter, a multimeter, etc.The ammeter is used in series with the load, so the same current flows through the load and the ammeter.