http://www.cirvirlab.com/index.php/electric/100-active-power-rea   
   tive-power-and-apparent-power.html   
      
      
   Product of sine wave voltage and current has always the same shape. However,   
   depending of phase (power factor), height of this product is different.   
   Actually this height is active power, while it's square counterpart is   
   reactive power. It can now be    
   simulated on:   
      
      
   http://www.cirvirlab.com/simulation/active_power_reactive_power_   
   nd_apparent_power_online.php   
      
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