FORMULAS, EQUATIONS & LAWS

Symbolic: E =VOLTS ~or~ (V = VOLTS) P =WATTS ~or~ (W = WATTS) R = OHMS ~or~ (R = RESISTANCE) I =AMPERES ~or~ (A = AMPERES) HP = HORSEPOWER PF = POWER FACTOR kW = KILOWATTS kWh = KILOWATT HOUR VA = VOLT-AMPERES kVA = KILOVOLT-AMPERES C = CAPACITANCE EFF = EFFICIENCY (expressed as a decimal)

DIRECT CURRENT

AMPS=	WATTS÷VOLTS	I = P ÷ E	A = W ÷ V
WATTS=	VOLTS x AMPS	P = E x I	W = V x A
VOLTS=	WATTS ÷ AMPS	E = P ÷ I	V = W ÷ A
HORSEPOWER=	(V x A x EFF)÷746
EFFICIENCY=	(746 x HP)÷(V x A)

AC SINGLE PHASE ~ 1ø

AMPS=	WATTS÷(VOLTS x PF)	I=P÷(E x PF)	A=W÷(V x PF)
WATTS=	VOLTS x AMPS x PF	P=E x I x PF	W=V x A x PF
VOLTS=	WATTS÷AMPS	E=P÷I	V=W÷A
VOLT-AMPS=	VOLTS x AMPS	VA=E x I	VA=V x A
HORSEPOWER=	(V x A x EFF x PF)÷746
POWERFACTOR=	INPUT WATTS÷(V x A)
EFFICIENCY=	(746 x HP)÷(V x A x PF)

AC THREE PHASE ~ 3ø

AMPS=	WATTS÷(1.732 x VOLTS x PF)	I = P÷(1.732 x E x PF)
WATTS=	1.732 x VOLTS x AMPS x PF	P = 1.732 x E x I x PF
VOLTS=	WATTS÷AMPS	E=P÷I
VOLT-AMPS=	1.732 x VOLTS x AMPS	VA=1.732 x E x I
HORSEPOWER=	(1.732 x V x A x EFF x PF)÷746
POWERFACTOR=	INPUT WATTS÷(1.732 x V x A)
EFFICIENCY=	(746 x HP)÷(1.732 x V x A x PF)