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1. BY:-Ramani Romil
Shoeb Ranger

2.  History
 How does it work?
 How is it used?
 Impact of the circuit
 Summary

3.  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

4.  Uses ratio of 3 known resistors
 Measures fourth unknown resistance
 Balanced voltage between point 1 and
battery’s negative, and between point 2 and
battery’s negative allows the measurement

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

7.  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

8.  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

9.  Created in 1833, popularized in 1840s
 Wheatstone bridges are one of the best methods of
measuring resistance due to the basic mathematical
ratio involved.
 Accurate standards with sensitive enough voltmeter,
measurements of resistance within .05% can be reached.
 Many calibration laboratories still use this method
today.
 The Wheatstone Bridge are replaceable; however, for its
simplicity and versatility the circuit is an indispensible
piece of technology