Themes > Science > Physics > Electromagnetism > Electrostatics > Batteries, current, and Ohm's law > Ohm's Law, Formulas & Equations



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)


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