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ELECTRICAL ENGINEERING FORMULAS

DIRECT CURRENT(DC)

I = current(amps.), V = voltage(volts), R = resistance(ohms), P = power(watts)

  • CURRENT:
  • I = V/R or I = P/V    
  • VOLTAGE:
          V= P/I or V = IR  
  • POWER:
          I2R or VI       
  • RESISTANCE:
          R = V/I   
 
         

 

ALTERNATING CURRENT(AC)

Il = line current(amps.), Ip = phase current(amps.), Vp = phase voltage(volts), Vl = line voltage(volts), Z = impedance(ohms), P = power(watts)

f = power factor(angle), VAR = volt-ampers

      

  • CURRENT(single phase):
         I = P/(Vp cos(f)
  • CURRENT(3 phase):
          I = P/3(Vl cos(f)) or I = P/3(Vp cos(f))
  • POWER(single phase):
          P = (VpIp cos(f))
  • POWER(3 phase):
          P = 3(VlIl cos(f)) or P = 3(VpIp cos(f))

 


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Last updated 11-03-2006