| 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 |
