Metre Bridge Calculator

Definition

Unknown Resistance is the opposition to the flow of electric current in a circuit, measured in ohms, and depends on the material and its dimensions.

Electric resistance is the opposition to the flow of an electric current and is measured in ohms, representing how much a material hinders electric current flow.

Wire Length is the length of a wire that affects the resistance and conductivity of an electric circuit, influencing the flow of electric current.

Final Length of Wire is the length of the wire after it has been stretched or compressed due to the flow of electric current.

How to calculate Unknown Resistance using Metre Bridge

Let's assume the following values:

Electric Resistance (R) = 15 Ohms
Wire Length (Lwire) = 0.035 m
Final Length of Wire (Lf,wire) = 0.0639 m

Using the formula:

$Rx = R \cdot \frac{L_{\text{wire}}}{L_{f,\text{wire}}}$

Evaluating:

$Rx = 15 \cdot \frac{0.035}{0.0639}$

The Unknown Resistance is 8.21596244131455 Ohms.

Unknown Resistance Conversion Chart

Electric Resistance (R, Ohms)	Wire Length (Lwire, m)	Final Length of Wire (Lf,wire, m)	Unknown Resistance (Rx, Ohms)
10	0.03	0.06	5.0000
10	0.03	0.063	4.7619
10	0.03	0.066	4.5455
10	0.03	0.069	4.3478
10	0.032	0.06	5.3333
10	0.032	0.063	5.0794
10	0.032	0.066	4.8485
10	0.032	0.069	4.6377
10	0.034	0.06	5.6667
10	0.034	0.063	5.3968
10	0.034	0.066	5.1515
10	0.034	0.069	4.9275
10	0.036	0.06	6.0000
10	0.036	0.063	5.7143
10	0.036	0.066	5.4545
10	0.036	0.069	5.2174
10	0.038	0.06	6.3333
10	0.038	0.063	6.0317
10	0.038	0.066	5.7576
10	0.038	0.069	5.5072
12	0.03	0.06	6.0000
12	0.03	0.063	5.7143
12	0.03	0.066	5.4545
12	0.03	0.069	5.2174
12	0.032	0.06	6.4000
12	0.032	0.063	6.0952
12	0.032	0.066	5.8182
12	0.032	0.069	5.5652
12	0.034	0.06	6.8000
12	0.034	0.063	6.4762
12	0.034	0.066	6.1818
12	0.034	0.069	5.9130
12	0.036	0.06	7.2000
12	0.036	0.063	6.8571
12	0.036	0.066	6.5455
12	0.036	0.069	6.2609
12	0.038	0.06	7.6000
12	0.038	0.063	7.2381
12	0.038	0.066	6.9091
12	0.038	0.069	6.6087
14	0.03	0.06	7.0000
14	0.03	0.063	6.6667
14	0.03	0.066	6.3636
14	0.03	0.069	6.0870
14	0.032	0.06	7.4667
14	0.032	0.063	7.1111
14	0.032	0.066	6.7879
14	0.032	0.069	6.4928
14	0.034	0.06	7.9333
14	0.034	0.063	7.5556
14	0.034	0.066	7.2121
14	0.034	0.069	6.8986
14	0.036	0.06	8.4000
14	0.036	0.063	8.0000
14	0.036	0.066	7.6364
14	0.036	0.069	7.3043
14	0.038	0.06	8.8667
14	0.038	0.063	8.4444
14	0.038	0.066	8.0606
14	0.038	0.069	7.7101
16	0.03	0.06	8.0000
16	0.03	0.063	7.6190
16	0.03	0.066	7.2727
16	0.03	0.069	6.9565
16	0.032	0.06	8.5333
16	0.032	0.063	8.1270
16	0.032	0.066	7.7576
16	0.032	0.069	7.4203
16	0.034	0.06	9.0667
16	0.034	0.063	8.6349
16	0.034	0.066	8.2424
16	0.034	0.069	7.8841
16	0.036	0.06	9.6000
16	0.036	0.063	9.1429
16	0.036	0.066	8.7273
16	0.036	0.069	8.3478
16	0.038	0.06	10.1333
16	0.038	0.063	9.6508
16	0.038	0.066	9.2121
16	0.038	0.069	8.8116
18	0.03	0.06	9.0000
18	0.03	0.063	8.5714
18	0.03	0.066	8.1818
18	0.03	0.069	7.8261
18	0.032	0.06	9.6000
18	0.032	0.063	9.1429
18	0.032	0.066	8.7273
18	0.032	0.069	8.3478
18	0.034	0.06	10.2000
18	0.034	0.063	9.7143
18	0.034	0.066	9.2727
18	0.034	0.069	8.8696
18	0.036	0.06	10.8000
18	0.036	0.063	10.2857
18	0.036	0.066	9.8182
18	0.036	0.069	9.3913
18	0.038	0.06	11.4000
18	0.038	0.063	10.8571
18	0.038	0.066	10.3636
18	0.038	0.069	9.9130
20	0.03	0.06	10.0000
20	0.03	0.063	9.5238
20	0.03	0.066	9.0909
20	0.03	0.069	8.6957
20	0.032	0.06	10.6667
20	0.032	0.063	10.1587
20	0.032	0.066	9.6970
20	0.032	0.069	9.2754
20	0.034	0.06	11.3333
20	0.034	0.063	10.7937
20	0.034	0.066	10.3030
20	0.034	0.069	9.8551
20	0.036	0.06	12.0000
20	0.036	0.063	11.4286
20	0.036	0.066	10.9091
20	0.036	0.069	10.4348
20	0.038	0.06	12.6667
20	0.038	0.063	12.0635
20	0.038	0.066	11.5152
20	0.038	0.069	11.0145

Metre Bridge Calculator

Formula

Definition

How to calculate Unknown Resistance using Metre Bridge

Unknown Resistance Conversion Chart