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 2380 wires is grounded (at zero potential. The resistive material inside the potentiometer has a resistance of 325 Ohms per millimeter. To what distance x should the wiper be moved so that 12.8 milliamps of current pass through point B? Number With the wiper in this position, what is the potential at point B Number

Explanation / Answer

Resistance = V/I = 60.4/0.0128 = 4718.75

this resistance is provided by variable and fix resistor

=> 2380 + R_pot = 4718.75

=> R_pot = 4718.75 - 2380 =2338.75 ohm = 325*x

=> x = 2338.75/325 = 7.196 mm Answer

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