ENGINEERING FORMULA

ELECTRICAL

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), VA = volt ampers

• CURRENT(single phase):
I = P/(Vp cos(f)

                                                                                       Last updated 08-25-2015