|
Parameter |
Symbol | Measuring unit |
Description |
| Voltage |
Volt |
V or E |
Unit of Electric Potential
V = I x R |
| Current |
Ampere |
I or i |
Unit of Electric current
I = V / R |
| Resistance |
Ohm |
R |
Unit of Resistance
R = V / I |
| Conductance |
Siemen or Mho |
G |
Unit of conductance G = 1 / R |
| Power |
Watts |
W |
Unit of power
P = V x I |
| Capacitance |
Farad |
C |
Unit f capacitance
C = Q / V |
|
Inductance |
Henery |
L or H |
Unit of Inductance
VL = – L(di / dt) |
|
Charge |
Coulomb |
Q |
Unit of Electric Charge
Q = C x V |
|
Frequency |
Hertz |
Hz |
Unit of Frequency
F = 1 / T |
|
Period |
Sec |
S |
Unit of period
T = 1 / f |
|
Impedance |
Ohm |
Z |
Unit of AC resistance
Z2 = R2 + X2 |
Ohms Law Formula
| Known Value | Resistance ( R ) | Current ( I ) | Voltage ( V ) | Power ( P ) |
| Current and Resistance | — | — | V = I x R | P = I2 x R |
| Voltage and Current | R = V / I | — | — | P = V x I |
| Power and Current | R = P / I2 | — | V = P /I | — |
| Voltage and Resistance | — | I = V / R | — | P = V2 / R |
| Power and Resistance | — | I = √P/R | V = √PxR | — |
| Voltage and Power | R = V2 / P | I = P / V | — | — |
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