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3B Scientific Resistance Bridge User Manual

Page 3

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www.3bscientific.com

Subject to technical amendments

© Copyright 2013 3B Scientific GmbH

• Measure

the

length

l

and diameter d of the

wire used and from this compute the cross-
sectional area F.

• Determine the resistance R

X

as described

under 5.1.

• For computed resistance R

X

the following is

true:

F

l

R

X

ρ

=

Whereby ρ is the specific resistivity, l is the
length of the wire in m and F is its cross-
sectional area in m

2

.

• The following is true for its specific resis-

tance:

l

F

R

X

=

ρ

• Repeat the experiment with various voltages

and wires of varying lengths, enter the data
into a table and work out the mean value.


Fig. 2 Determining resistance in a Wheatstone bridge circuit