wheatstone bridge
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Definition
Noun: A Wheatstone bridge is an electrical circuit used to measure an unknown electrical resistance by balancing two legs of a bridge circuit. One leg contains the unknown component, while the other legs contain known resistances.
Usage
The term "Wheatstone bridge" is used as a singular, countable noun. It refers specifically to the measuring instrument or circuit configuration. - It is typically used in scientific, engineering, and educational contexts related to electronics and electrical measurement. - It is often preceded by the definite article "the" or the indefinite article "a" when referring to the circuit principle or a specific instance of it.
Examples
- Noun:
- The technician used a Wheatstone bridge to determine the value of the sensor's resistance.
- Accurate measurement of small resistance changes often requires a Wheatstone bridge.
- The principle of the Wheatstone bridge is fundamental to many modern electronic instruments.
Advanced Usage
- "A balanced Wheatstone bridge": Refers to the state where the bridge circuit is adjusted so that no current flows through the galvanometer (the detector in the center of the bridge), indicating the ratio of resistances is equal.
- When the Wheatstone bridge is balanced, the unknown resistance can be calculated from the three known values.
Variants and Related Words
- Bridge circuit (n): A more general term for a circuit topology that has four arms connected in a diamond shape, used for measurements. The Wheatstone bridge is a specific type of bridge circuit.
- Resistance bridge (n): Another general term often used synonymously with Wheatstone bridge, especially when measuring resistance.
Synonyms
- Null-balance bridge: Emphasizes the method of balancing the circuit to achieve a null (zero) reading on the detector.
- Resistance-measuring bridge: A descriptive synonym highlighting its primary function.
Related Phrases
- "To balance a Wheatstone bridge": The action of adjusting the known resistances until the measured voltage across the center of the bridge is zero.
- It took several minutes to balance the Wheatstone bridge and obtain a precise reading.
- "Wheatstone bridge configuration": Describes the specific arrangement of four resistors (or impedance elements) in a circuit.
- The sensor is wired in a Wheatstone bridge configuration to improve measurement sensitivity.
Noun
- a bridge used to measure resistances