In this video, electrical engineer Barron Stone measures components with a variable resistance using a Wheatstone bridge circuit. Learn how the differential output voltage from a Wheatstone bridge indicates the ratio between two voltage dividers. Explore
- [Instructor] The Wheatstone Bridge is a common…circuit configuration that can be used to measure…the value of an unknown resistor…by comparing it to known resistors,…and it can be used to detect very small changes…in the resistance of a component.…Wheatstone Bridges are frequently used…to measure resistive sensors…like strain gauges and thermistors,…because they can detect the small change…in a sensor's resistance.…The Wheatstone Bridge consists of four resistors…arranged as two parallel sets of resistors in series.…
By controlling the input voltage…and the value of three resistors,…then measuring the output voltage…between these two middle nodes,…it's possible to calculate the value of the fourth,…unknown resistance, represented here as RX.…By carefully tuning the other three resistors…in the circuit, the Wheatstone Bridge can provide…extremely accurate resistance measurements.…The schematic for a Wheatstone Bridge…is typically drawn with the four resistors…at 45 degree angles as shown here.…
But if I straighten it out, it's easier to recognize…
- Reading electrical schematics
- Building circuits on breadboards
- Reviewing types of static and variable resistors
- Reading resistor color codes
- Measuring resistance with a DMM
- Measuring resistive sensors with an Arduino microcontroller
- Making electrical signal measurements with an oscilloscope
- Measuring AC voltage with a DMM
- Understanding the time domain and frequency domain
- Designing passive low-pass and high-pass filters
- Reviewing reactive RC and RL circuits
- The relationship between capacitors and inductors
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1. Building Circuits
Read electrical schematics6m 25s
3. Resistive Circuits
4. Oscilloscope Measurements
6. Alternating Current
7. Electrical Signals
8. Reactive Circuits
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