September 2017
Intermediate to advanced
700 pages
28h 19m
English
Content preview from Automobile Electrical and Electronic Systems, 5th Edition
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Electrical and electronic principles
19
Figure 1.24 Wheatstone bridge
Figure 1.25 Bridge and amplier circuit.
1.3.5 Bridge circuits
There are many types of bridge circuits but they are all based on the principle
of the Wheatstone bridge, which is shown in Figure 1.24. The meter shown is
a very sensitive galvanometer. A simple calculation will show that the meter will
read zero when:
R
1
/R
2
= R
3
/R
4
To use a circuit of this type to measure an unknown resistance very accurately
(R1), R3 and R4 are pre-set precision resistors and R2 is a precision
resistance box. The meter reads zero when the reading on the resistance box
is equal to the unknown resistor ...
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