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A '''resistor''' is a element in an electrical circuit which impedes the flow of current through the resistor.

The relationship between the [[voltage]] across a resistor, the [[current]] through it, and the degree of resistance is given by '''Ohm's Law''', which states that the current (in amperes) is equal to the voltage (in volts) divided by the resistance  in '''ohms''' (the unit being named in honour of the discoverer).

Resistors convert a portion of the current flowing through them into heat; the amount (in watts) is equal to the current (in amperes) squared, times the resistance (in ohms).

Resistors show the same impedance to [[direct current]] as they do to [[alternating current]], of any [[frequency]].

==See also==

* [[Capacitor]]
* [[Inductor]]

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