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 82.6 V battery, one fixed resistor, and one potentiometer. In addition, one of the wires is grounded (at zero potential). The resistive material inside the potentiometer has a resistance of 425 Ohms per millimeter. To what distance x should the wiper be moved so that 14.8 milliamps of current pass through point B?

Explanation / Answer

say (lambda = 225 Omega /mm ) (V=93.7 ) V (I= 14.8 mA) The total resistance of the circuit, (R = (lambda x + 2680) Omega = V/I = 6331.0811 Omega ) ==> x = 16.22703 mm Potential at B, (V_B = -39.664 V)

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