Electrical formulas: Please enter two values,the other two values are automatically calculated
AC circuits
Electrical formulas to calculate KVA ,KW,Power Factor, current for single phase and three phase.
Desired Data
Single Phase
Three Phase
KVA
Volts x Amps 1000
1.73 x Volts x Amps 1000
KW
Volts x Amps x PF 1000
1.73 x Volts x Amps x PF 1000
Power factor
KW KVA
KW KVA
Amperes-When KW is known
KW x 1000 Volts x PF
KW x 1000 1.73 x Volts x PF
Amperes-When KVA is known
KVA x 1000 Volts
KVA x 1000 1.73 x Volts
Current (Amp)
I=√(TC-(TA+ ∆TD)) ÷(RDC)(1+YC)RCA)
where: TC = conductor temperature in °C TA = ambient temperature in °C ∆TD = dielectric loss temperature rise RDC = dc resistance of conductor at temperature TC YC = component ac resistance resulting from skin effect and proximity effect RCA = effective thermal resistance between conductor and surrounding ambient
