Difference between revisions of "Resistor"
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| − | A '''resistor''' is a element in an electrical circuit which impedes the flow of current through the resistor. | + | A '''resistor''' is a passive 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). | + | The relationship between the [[voltage]] across the two connectors of 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 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). | ||
Revision as of 01:01, 2 May 2018
A resistor is a passive element in an electrical circuit which impedes the flow of current through the resistor.
The relationship between the voltage across the two connectors of 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.
