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A resistor is an electrical component that resists the flow of current. Resistors are used as part of electrical networks and incorporated into microelectronic? semiconductor devices. The critical measurement of a resistor is its resistance, which serves as a ratio of voltage to current and is measured by the SI unit Ohms. A component has resistance 1 Ohm if a voltage of 1 Volt across the component results in a current of 1 Ampere, or Amp, which is equivalent to 1.6x(10^19) electrons per second. |
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A resistor is an electrical component that resists the flow of current. Resistors are used as part of electrical networks and incorporated into microelectronic? semiconductor devices. The critical measurement of a resistor is its resistance, which serves as a ratio of voltage to current and is measured by the SI unit Ohms. A component has resistance 1 Ohm if a voltage of 1 Volt across the component results in a current of 1 Ampere, or Amp, which is equivalent to 1.6 · 1019 electrons per second. |
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The relationship between voltage, current, and resistance is given by the equation known as Ohms Law: |
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The relationship between voltage, current, and resistance though an object is given by a simple equation, often mistakenly referred to as Ohm's Law: |
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V = IR |
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V = IR |
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where V is the voltage across the resistor in Volts, I is the current through the resistor in Amperes, and R is the resistance in Ohms?s. An ideal resistor has a fixed resistance across all frequencies and amplitudes of voltage or current. |
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where V is the voltage across the object in Volts, I is the current through the object in Amperes, and R is the resistance in Ohms?s. If V and I have a linear relationship -- that is, R is constant -- along a range of values, the material of the object is said to be ohmic on that range. An ideal resistor has a fixed resistance across all frequencies and amplitudes of voltage or current. |
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