Electrical Engineering ⇒ Topic : Reactive power

Samual
 
Reactive power. The component of apparent power which is neither consumed nor does any useful work in the circuit is called reactive power. The power consumed (or true power) in L and C is zero because all the power received from the source in one quartercycle is returned to the source in the next quartercycle. This circulating power is called *reactive power. Now, cunent and voltage in L or C are 90° out of phase. Therefore, current 90° out of phase with voltage contributes to reactive power. The product of voltage (I) and component of total current 90^{0} out of phase with voltage (I sin Φ) is equal to reactive power i.e. Reactive power, Q= Voltage x Component of total current 90° out of phase with voltage = V X I sin Φ Q = VI sin Φ It is measured in voltamperes reactive (VAR). The component I sin Φ is called the reactive component (or wattless component) and contributes to reactive power (i.e. VI sin Φ). It does no useful work in the circuit and merely flows back and forth in both directions in the circuit. A wattmeter does not measure the reactive power.  
 
Samual
 
Reactive power. The component of apparent power which is neither consumed nor does any useful work in the circuit is called reactive power. The power consumed (or true power) in L and C is zero because all the power received from the source in one quartercycle is returned to the source in the next quartercycle. This circulating power is called *reactive power. Now, cunent and voltage in L or C are 90° out of phase. Therefore, current 90° out of phase with voltage contributes to reactive power. The product of voltage (I) and component of total current 90^{0} out of phase with voltage (I sin Φ) is equal to reactive power i.e. Reactive power, Q= Voltage x Component of total current 90° out of phase with voltage = V X I sin Φ Q = VI sin Φ It is measured in voltamperes reactive (VAR). The component I sin Φ is called the reactive component (or wattless component) and contributes to reactive power (i.e. VI sin Φ). It does no useful work in the circuit and merely flows back and forth in both directions in the circuit. A wattmeter does not measure the reactive power.  
 
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