# Potentiometer Resistance Chart

As is described in the section on sound, the sound that we hear doesn't correspond linearly to the amount of electric power used; it instead corresponds logarithmically. A volume control knob must, therefore, have a non-linear change in resistance as well. We graphed the resistance of the potentiometer for every 5 degrees of rotation of the knob in order to measure this effect. To measure the resistance across the potentiometer, we connected a digital multimeter, set to 20 ohms (the maximum resistance of the resistor), to its center lead and to one of its two side leads. We then used a protractor to move the knob in 5 degree increments, noting the resistance every 5 degrees. This is the graph resulting from that measurement:

Potentiometer graph of resistance vs. position.

Here is the data used to form that graph:

RESISTANCE (Kω) ANGLE (DEGREES)
97.5 225
97.5 220
97.5 215
97.6 210
97.4 205
97.2 200
93.5 195
84.5 190
74.5 185
67.8 180
62 175
60.6 170
55.9 165
48.3 160
40.8 155
35.8 150
30.1 145
21.5 140
17.7 135
16.4 130
15.7 125
14.7 120
13.9 115
13.4 110
12.6 105
11.9 100
11 95
10.5 90
10.1 85
9.8 80
9 75
8.4 70
7.8 65
6.9 60
6.5 55
5.8 50
5.2 45