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IEVref: | 131-11-44 | ID: | |

Language: | en | Status: Standard | |

Term: | reactive power | ||

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Symbol: | Q
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Definition: | for a linear two-terminal element or two-terminal circuit, under sinusoidal conditions, quantity equal to the product of the apparent power S and the sine of the displacement angle φ $Q=S\mathrm{sin}\phi $ Note 1 to entry: The reactive power is the imaginary part of the complex power $\underset{\_}{S}$, thus $Q=\text{\hspace{0.17em}}\mathrm{Im}\text{\hspace{0.17em}}\underset{\_}{S}$. Its absolute value is equal to the non-active power, thus $\left|Q\right|={Q}_{\sim}$. Note 2 to entry: The coherent SI unit for reactive power is voltampere, VA. The special name var and its symbol var are also used. See 131-11-45. | ||

Publication date: | 2013-08 | ||

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$Q=S\mathrm{sin}\phi $

Note 1 to entry: The reactive power is the imaginary part of the complex power $\underset{\_}{S}$, thus $Q=\text{\hspace{0.17em}}\mathrm{Im}\text{\hspace{0.17em}}\underset{\_}{S}$. Its absolute value is equal to the non-active power, thus $\left|Q\right|={Q}_{\sim}$.

Note 2 to entry: The coherent SI unit for reactive power is voltampere, VA. The special name var and its symbol var are also used. See 131-11-45.