1. A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element.
  2. Resistors act to reduce current flow, and, at the same time, act to lower voltage levels within circuits.
  3. An electric component that transmits current in direct proportion to the voltage across it.

    Appears in these related concepts:

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Resistor Color Code

This tool is used to decode information for color banded axial lead resistors. Select the number of bands, then their colors to determine the value and tolerance of the resistors
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Ohms law

Ohm's law states that the voltage (V) across a resistor is proportional to the current (I), where the constant of proportionality is the resistance (R).

Equivalently, Ohm's law can be stated:

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High School Physics - Ohm's Law
  • Ohm's Law refers to the proportion relation between voltage and current. It also applies to the specific equation V=IR, which is valid when considering circuits that contain simple resistors
  • Voltage drives current while resistance impedes it.

    • There are components and circuits that are non-ohmic; their I-V plots are not linear and/or don't pass through the origin.

Series and parallel resistors

In a series configuration, the current through all of the resistors is the same, but the voltage across each resistor will be in proportion to its resistance. The potential difference (voltage) seen across the network is the sum of those voltages, and now the total resistance can be found as the sum of those resistances:
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How a Resistor Works and Explantion

What is a resistor?