Determining resistances using a Wheatstone bridge

VP3.2.3.4
Determining resistances using a Wheatstone bridge
Determining resistances using a Wheatstone bridge Circuit diagram of Wheatstone bridge (P3.2.3.4)
Determining resistances using a Wheatstone bridge

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Description

In the experiment P3.2.3.4, a voltage U is applied to a 1 m long measuring wire with a constant cross-section. The ends of the wire are connected to an unknown resistor Rx and a variable resistor R arranged behind it, whose value is known precisely. A sliding contact divides the measuring wire into two parts with the lengths s1 and s2. The slide contact is connected to the node between Rx and R via an ammeter which is used as a zero indicator. Once the current has been regulated to zero, the relationship

applies. Maximum accuracy is achieved by using a symmetrical experiment setup, i. e. when the slide contact over the measuring wire is set in the middle position so that the two sections s1 and s2 are the same length.

Components of equipment sets

1 53602  8  Demonstration bridge LD
1 536121  8  Measuring resistor, 10 Ω LD
1 536131  8  Measuring resistor, 100 Ω LD
1 536141  8  Measuring resistor, 1 kΩ LD
1 536776  4  Decade resistor, 0...1 kΩ LD
1 536777 Decade resistor, 0...100 Ω LD
1 536778 Decade resistor, 0...10 Ω LD
1 536779 Decade resistor, 0...1 Ω LD
1 521487 AC/DC power supply PRO 0...12 V/3 A LD
1 531131  4  Galvanometer PT 3204 LD
2 50126  4  Connecting lead, 32 A, 50 cm, blue LD
3 50128  4  Connecting lead, 32 A, 50 cm, black LD
1 50130  4  Connecting lead, 32 A, 100 cm, red LD
1 50131  4  Connecting lead, 32 A, 100 cm, blue LD

Experiment Instructions

PDF (Experiment description) PDF (Experiment description) P3.2.3.4 Determining resistances using a Wheatstone bridge
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