A resistance or R ohm draws a current from a potentiometer.The potentiometer has a total resistance R0 ohm.A voltage V is supplied to the potentiometer .Derive an expression for the voltage fed to the ckt when the slide is in the middle of the potentiometer. Share with your friends Share 23 Satyendra Singh answered this The following figure show the arrangement: When the slide is in the middle of the potentiometer only half of its total resistance,i.e.,R02 Since R ∝ length will be between A and B, say R1, will be given by the the following expression:1R1 = 1R + 1R02R1 = R0RR0+2RThe total resistance between A and C will be sum of the resistance between A & B and B & C,i.e.,R1 + R02The current flowing throught he potentiometer will be I = VR1 + R02 = 2V2R1 + R0 The voltage V1 taken from the potentiometer will be the product of current I and the resistance R1,V1 = IR1 = 2V2 R0RR0+2R+R0 × R0RR0+2RV1 = 2VR2R + R0 + 2R = 2VRR0 + 4R 177 View Full Answer