3B Scientific Resistance Apparatus - Manual

3B SCIENTIFIC® PHYSICS
1
Resistance Apparatus 1009949
Instruction sheet
09/12 ADP BJK
1 4-mm connectors
2 Base plate
3 Resistance wires
1. Safety instructions
If the current is too high, it can lead to the resis-
tance wires becoming destroyed.
• Do not exceed the stated values for current.
The resistance wires are thin and can stretch or
snap.
• Always carry the device by the base plate,
never try to lift the wires.
2. Description
The resistance measurement bridge is a useful
tool for exploring the factors that contribute to a
wire’s overall resistance. It is used to investigate
the dependency of electrical resistance on con-
ductor length, conductor cross-section and ma-
terial.
The resistance measurement bridge is made up
of six wires laid out side by side on a base plate
with both ends connected to 4-mm sockets.
3. Technical data
Material Diameter Current
Constantan 1 mm 2 A max.
Constantan
2x
0.7 mm 2 A max.
Constantan 0.5 mm 1.5 A max.
Constantan 0.35 mm 1 A max.
Brass 0.5 mm 2.5 A max.
Dimensions: 1085 x 70 x 55 mm 3
Length of wires: 1000 mm
Weight: approx. 1.5 kg
4. Sample experiments
It is recommended to use the analogue multime-
ter AM51 (1003074) to determine the resistance
of the wires.
To avoid measuring errors, it is necessary to
take account of the resistance of cables.
• The multimeter leads should be shorted
together so that only their resistance is
measured and the meter should then be
calibrated to register that resistance as zero.