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What is Real Power, reactive power & apparent Power? What is Joules Heating?
Electrical Design Class-7 Electrical Power Real Reactive Apparent KW KVA KVAr Wattage-min

What is Real Power, reactive power & apparent Power? What is Joules Heating?

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Electrical Power | Real | Reactive | Apparent | KW | KVA | KVAr | P

This is an article on Electrical Design, in which I will start from the basics and then go to the pro level of designing. In this video, I have explained basic electrical engineering and explained what is electrical power. What is Real Power, reactive power & apparent Power? What is Joules Heating? Why we transmit electrical power in high voltage?

Electric power is the rate at which electrical energy is transferred per unit time in an electric circuit. The SI unit of power is the watt, one joule per second and represented by the letter P. The term wattage is used colloquially to mean "electric power in watts."
In the case of resistive (Ohmic, or linear) loads, Joule's law can be combined with Ohm's law (V = I·R) to produce alternative expressions for the amount of power that is dissipated where R is the electrical resistance.
In the case of resistive (Ohmic, or linear) loads, Joule's law can be combined with Ohm's law (V = I·R) to produce alternative expressions for the amount of power that is dissipated where R is the electrical resistance.

Joule Heating

Resistors oppose the flow of electric current; therefore, electrical energy is required to push current through the resistance. This electrical energy is dissipated, heating the resistor in the process. This is called Joule heating, ohmic heating or resistive heating.

In many cases this dissipation of electrical energy as heat is considered as power loss.particularly in the case of transmission losses in power lines. That is why we do High voltage transmission helps reduce the losses by reducing the current for a given power.

In electric stoves and other electric heaters, we use Joule heating. And also in incandescent lamps rely on Joule heating: the filament is heated to such a high temperature that it glows “white hot” with thermal radiation.H

Power triangle The relationship between real power, reactive power and apparent power can be expressed by representing the quantities as vectors.
Real power = Active power = VI Cosθ , Unit W or KW Reactive Power = VI Sinθ , Unit VAr or KVAr Apparent Power = VI , Unit VA or KVA The ratio of real power to apparent power is called power factor and is a number always between 0 and 1. Where the currents and voltages have non-sinusoidal forms, power factor is generalized to include the effects of distortion.
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