Electric current

Electric power
Electric power is the rate, per unit time, at which electrical energy is transferred by an electric circuit. The SI unit of power is the watt, one joule per second.
Electric power is usually produced by electric generators, but can also be supplied by sources such as electric batteries. It is usually supplied to businesses and homes (as domestic mains electricity) by the electric power industry through an electric power grid.
Electric power can be delivered over long distances by transmission lines and used for applications such as motion, light or heat with high efficiency.^[1]
Electric power, like mechanical power, is the rate of doing work, measured in watts, and represented by the letter P. The term wattage is used colloquially to mean "electric power in watts." The electric power in watts produced by an electric current I consisting of a charge of Q coulombs every t seconds passing through an electric potential (voltage) difference of V is
{\displaystyle P={\text{work done per unit time}}={\frac {W}{t}}={\frac {W}{Q}}{\frac {Q}{t}}=VI}
P=W/t=VI
where

• 
  Q is electric charge in coulombs
  
• 
  t is time in seconds
  
• 
  I is electric current in amperes
  
• 
  V is electric potential or voltage in volts
  

Elektr quvvati - bu elektr zanjiri orqali elektr energiyasini uzatish tezligi, vaqt birligi uchun. SI quvvat birligi - vatt, soniyada bir joul.

Elektr quvvati odatda elektr generatorlari tomonidan ishlab chiqariladi, lekin elektr batareyalari kabi manbalardan ham ta'minlanishi mumkin. Odatda korxonalar va uylarga (mahalliy elektr energiyasi sifatida) elektr energetikasi tarmog'i orqali etkazib beriladi.
Elektr quvvati elektr uzatish liniyalari orqali uzoq masofalarga uzatilishi va yuqori samaradorlik bilan harakat, yorug'lik yoki issiqlik kabi ilovalar uchun ishlatilishi mumkin.[1]
Elektr quvvati, mexanik quvvat kabi, ishning tezligi bo'lib, vattlarda o'lchanadi va P harfi bilan ifodalanadi. Vatt atamasi so'zlashuv tilida "Vattdagi elektr quvvati" degan ma'noni anglatadi. V ning elektr potensiali (kuchlanish) farqi orqali har t sekundda Q kulon zaryadidan tashkil topgan I elektr toki tomonidan ishlab chiqarilgan vattdagi elektr quvvati.
P=W/t=VI
qayerda
• Q - kulondagi elektr zaryadi
• t - soniyalardagi vaqt
• I - amperdagi elektr toki
• V - elektr potensiali yoki voltsdagi kuchlanish
An electric motor converts electrical energy into kinetic energy. The reverse task, that of converting kinetic energy into electrical energy, is accomplished by a generator or dynamo. In many cases the two devices differ only in their application and minor construction details, and some applications use a single device to fill both roles. For example, traction motors used on locomotives often perform both tasks if the locomotive is equipped with dynamic brakes.
Most electric motors work by electromagnetism, but motors based on other electromechanical phenomena, such as electrostatic forces and the piezoelectric effect, also exist. The fundamental principle upon which electromagnetic motors are based is that there is a mechanical force on any current-carrying wire contained within a magnetic field. The force is described by the Lorentz force law and is perpendicular to both the wire and the magnetic field.
Most magnetic motors are rotary, but linear motors also exist. In a rotary motor, the rotating part (usually on the inside) is called the rotor, and the stationary part is called the stator. The rotor rotates because the wires and magnetic field are arranged so that a torque is developed about the rotor's axis. The motor contains electromagnets that are wound on a frame. Though this frame is often called the armature, that term is often erroneously applied. Correctly, the armature is that part of the motor across which the input voltage is supplied.