electrical resistance

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electrical resistance

A student measures the electrical resistance of a wire with a multimeter.

Definition
  1. Noun:
    • A material's opposition to the flow of electric current: This is the fundamental property of a material that impedes or resists the movement of electric charge. It is a measure of how difficult it is for current to pass through a conductor.
    • Measured in ohms: The standard unit of measurement for electrical resistance is the ohm (symbol: Ω).
Usage Examples
  • Noun:
    • Copper wire has a low electrical resistance, making it an excellent conductor.
    • The engineer calculated the circuit's total electrical resistance to ensure safety.
    • Increasing the length of a wire typically increases its electrical resistance.
Advanced Usage
  • "To measure electrical resistance": To determine the opposition to current flow in a component or material.
    • Technicians use a multimeter to measure the electrical resistance of the component.
  • "Electrical resistance changes with temperature": Describing how the property is not constant and varies with physical conditions.
    • For most conductors, electrical resistance increases as the temperature rises.
Variants and Related Words
  • Resistance (n): A common shortened form of "electrical resistance" used in many technical contexts.
    • Check the resistance of this resistor.
  • Resistor (n): A passive electrical component specifically designed to provide a known amount of electrical resistance in a circuit.
    • A 10kΩ resistor was used in the design.
  • Resistivity (n): An intrinsic material property that quantifies how strongly a material opposes current flow, used to calculate the resistance of a specific object.
    • The resistivity of silver is very low.
Synonyms
  • Impedance (n): In AC circuits, a more general measure of opposition to current flow, which includes resistance as well as reactance (opposition from capacitors and inductors).
  • Ohmic resistance (n): A technical term specifically for the resistive component that obeys Ohm's Law.
Related Phrases
  • "To offer resistance": To provide opposition to current flow.
    • The long, thin wire offers more resistance than a short, thick one.
  • "A drop in resistance": A decrease in the opposition to current.
    • The faulty connection caused a sudden drop in resistance, leading to a short circuit.
electrical resistance

A student measures the electrical resistance of a wire with a multimeter.

Noun
  1. a material's opposition to the flow of electric current; measured in ohms

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