# Resistance

- The electrical resistance of a conductor is defined by:
- where I is the current flowing through the conductor and V is the potential difference across the conductor.
- The power disipated by a resistor is given by Joule′s law:
- where
*W*= power disipated [Watt]*I*= current [Ampere]*R*= resistance [Ohm]*V*= potential difference across resistor [Volt]
| Enter two values and the other values will be calculated. |

- The total resistance
*R*of a series of resistors in series is:
Resistors in Series |

- The total resistance
*R*of a series of resistors in parallel is:
Resistors in Parallel |

**See also: **Abohm, Dynamic Resistance, Equivalent Resistance, I Squared R Losses, Joules Laws, Leakage Resistance, Negative Resistance, Ohm, Ohmmeter, Positive Temperature Coefficient, Resistor, Rheostat, RLC Circuit, Superconductivity, Wheatstone Bridge.

**Subjects: ** Electronics Physics

- Jointing of Copper Busbars Busbar joining methods and joint resistance.

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