Formulas

OHMS HELPFUL GRAPHS

V = I x R              I = V÷R                    R = V ÷ I

P = V x I              P = V² ÷ R                P = I² x R

 
 Where V = Voltage | I = Current | R = Resistance | P = Power
INDUCTIVE RESISTANCE
 (XL) = 2∏fL or f = XL÷ 2∏L
 Where XL = Inductive Resistancee | ∏ = 3.14 | f = frequency | L = Inductance
CAPACITIVE RESISTANCE
 (XC) = 1÷2∏fC
 Where XL = Inductive Resistancee | ∏ = 3.14 | f = frequency | L = Inductance
TRANSFORMER CALCULATIONS
Np ÷ Ns = Vp ÷ Vs = Is ÷ Ip
Where P = primary | s = Secondary | N = Windings | V = Voltage | I = Current
EFFICIENCY
OUTPUT x 100 ÷ INPUT
POWER FACTOR
WATTS ÷ VOLTS x AMPS
REGULATION PERCENTAGE
VNL – VFL ÷ VNL x 100
Where NL = No Load | FL = Full Load
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