Define active power and reactive power for RLC series circuit.
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Active Power (P): Active power (P) is given by the product of voltage, current and the cosine of the phase angle between voltage and current. 

Unit: watt (W) or kilo-watt (kW) or Mega-watt (MW).

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Reactive Power (Q): Reactive power (Q) is given by the product of voltage, current and the sine of the phase angle between voltage and current. 

Unit: volt-ampere-reactive (VAr), or kilo-volt-ampere-reactive (kVAr) or Mega-voltampere-reactive (MVAr) 

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