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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. -
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| | Resistors in Series  - The total resistance R of a series of resistors in series is:
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| | Resistors in Parallel  - The total resistance R of a series of resistors in parallel is:
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See also: Abohm, Ohm, Ohmmeter, Resistor, Rheostat, Superconductivity, Wheatstone Bridge.
  
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