Formulas
Current (I) (amps)
| Parallel | IT = I1 + I2 + I3 |
|
Ohms law |
I = V/Ω |
| Individual current of resistor (Series) |
IT = I1 = I2 = I3 |
| Individual current of resistor (Parallel) |
(Total resistance / individual resistance) x total circuit current |
Voltage (V) (Volts)
| Voltage drop across each resistor | V = I x R |
| Voltage across resistros in a circuit (Parallel) | VT = V1 = V2 |
Power (W) (Watts)
| Power dissipated by a resistor | P = I x V |
| Power dissipated by a resistor | P = I2 x Ω |
| Power dissipated by a resistor | P = V2 / Ω |
Resistance (Ω) (Ohms)
| Resistance with multiple resistors (Parallel) | Ω = (R1-1 + R2-1 + R3-1) -1 |
| Resistance with multiple resistors (Seiries) | Ω = R1 + R2 + R3 |
| Ohms law | Ω = V / I |
| Resistivity | resistivity x length (m) / cross sectional area |
| Resistance at certain temprature | Resistor 1 resitance x (1 + resistance at temprature x (temp 1 - temp 2) |
Time constant (τ) (Tou)
| 1 time constant | τ = Capacitance x Resistance |