Wheatstone bridge

Wheatstone bridge

1. WHEATSTONE BRIDGE 1

2. History 2 The Wheatstone Bridge was invented in 1833 by Samuel Hunter Christie Later named after Sir Charles Wheatstone for his many applications of the circuit through the 1840s The most common procedure for the bridge remains the testing of unknown electrical resistance

3. Wheatstone Bridge 3

4. Analysis 4 Identify the currents

5. Consider the bridge at “balance”, i g =0 5

6. Some Algebra 6

7. Use to Measure Resistance 7 Ratio Arms

8. Working 8 By changing resistors to adjusting variable resistors to balance the device, the mathematical ratio is used to calculate the fourth (unknown) resistance

9. Applications 9 Main focus of the Wheatstone Bridge = applications using electricity The circuit monitors sensor devices like strain gauges – it reads the level of the strain in the system The galvanometer measures whether the gauges are balanced or not Electrical power distributors use the Wheatstone Bridge to locate breaks in the power lines

10. Impact of the Wheatstone Bridge 10 The Wheatstone Bridge is a very simple design, although there are more complex versions of achieving the same outcome Can be adjusted easily Fairly inexpensive to produce Also indirectly measures any variable that would change the resistance of a material Ex: temperature, force, pressure

11. THANK YOU 11