electric resistance
Học thuậtThân thiện
Definition
- Noun:
- A material's opposition to the flow of electric current: Electric resistance is the property of a substance that impedes or restricts the movement of electrical charge through it. It is a fundamental concept in physics and electrical engineering, determining how much current will flow for a given voltage.
- Measured in ohms: The standard unit of measurement for electric resistance is the ohm (symbol: Ω).
Usage Examples
- Noun:
- Copper wire has a very low electric resistance, making it excellent for conducting electricity.
- The engineer calculated the circuit's total electric resistance before selecting the appropriate components.
- Increasing the temperature of a conductor usually increases its electric resistance.
Advanced Usage
- "To measure electric resistance": To determine the opposition to current flow in a component or material.
- We used a multimeter to measure the electric resistance of the resistor.
- "Internal electric resistance": The opposition to current flow within a power source, such as a battery.
- A battery with high internal electric resistance will deliver less current to a circuit.
Variants and Related Words
- Resistance (n): A common shortened form of "electric resistance."
- The resistance of this component is 100 ohms.
- Resistor (n): A specific electrical component designed to provide a known amount of electric resistance in a circuit.
- I need a 1kΩ resistor for this part of the circuit.
- Resistive (adj): Having the property of electric resistance.
- The material's resistive properties were tested in the lab.
Synonyms
- Electrical resistance: A fully equivalent term.
- Impedance (n): In AC circuits, a more general measure of opposition to current flow that includes resistance and reactance. (Note: In DC circuits, impedance is equal to resistance.)
- Ohmic resistance: Resistance that obeys Ohm's Law (Voltage = Current × Resistance).
Related Phrases
- "To offer resistance": To provide opposition to current flow.
- The long, thin wire offers more resistance than a short, thick one.
- "Resistance is futile": A popular science-fiction idiom humorously applied to situations where opposition is pointless. (This is a cultural reference, not a technical term).
Related Idioms
- "The path of least resistance": The easiest course of action. This idiom borrows from the concept in physics where electric current follows the path with the lowest resistance.
- When faced with a difficult decision, people often choose the path of least resistance.
Noun
- a material's opposition to the flow of electric current; measured in ohms