A potentiometer is essentially a resistor with three contacts, one of which is m

Question

A potentiometer is essentially a resistor with three contacts, one of which is mobile. It acts as a variable resistor, since changing the position of the mobile contact called the "wiper" (denoted by an arrow) changes the amount of the resistor through which current must pass. The circuit to the right consists of one 60.4 V battery, one fixed resistor, and one potentiometer. In addition, one of the wires is grounded (at zero potential). 2080 The resistive material inside the potentiometer has a resistance of 175 Ohms per millimeter. To what distance x should the wiper be moved so that 10.8 milliamps of current pass through point B? Number With the wiper in this position, what is the potential at point B? Number

Explanation / Answer

a)

from ohm's law

V = IR

R = V/I

R = 60.4/(10.8 x 10^-3)

R = 5592.6 ohm

2080 + 175x = 5592.6

x = 20 mm

b)

potential at point B,

= -2080 x 0.0108

= -22.464 V

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