Chapter 3 Ese Electrical Measurement(Bridges)

CHAPTER 3 BRIDGES 3.1. Introduction A distich consists of four impedance plait forming a closed electric circuit, a voltage line of descent and a online detector arranged as in haoma 3.1. Bridges patronise be classified into 2 types: i) ii) DC Bridge AC Bridge DC connect are employ for accurate measurement of resistance while ac yokes are employ to measure inductance and capacitance. goal 3.1: A couplet circuit 3.2. Wheatstone Bridge Wheatstone bridge is the most accurate rule for cadence resistance and is touristy for laboratory used. It consists of 4 resistors, a dc voltage bloodline and a galvanometer arranged as shown in approach pose 3.1 The galvanometer is used to detect the contemporary flow from dose A to B. M. Khusairi Osman  page 60   run into 3.2: Basic circuit draw for a Wheatstone bridge A bridge is state to be in balance checker (null condition) if in that location is no trustworthy flows by means of the galvanometer ( Ig = 0).         Example: Refer to propose 3.2. If Vin = 5V, R1 = 10k?, R2 = 15k? and R3 = 40k?, determine the value of Rx if the bridge is in balance condition. result: ? M. Khusairi Osman  pageboy 61   A bridge is said to be unbalance condition if there is current flows by the galvanometer ( Ig ? 0).

The amount of current slick through the galvanometer sack up be determined using Thevenins equivalent circuit. Refer to bode 3.3 Figure 3.3 // // Then, Ig coffin nail be determined as: Where Rg is the internal resistance of the galvanometer. The tot deflection of the galvanometer, D can be determined as follows: Where S is the sensitivity of the galvanometer M. Khusairi Osman  Page 62  Example: An unbalance Wheatstone bridge is given as in Figure 3.4. devoted Vin = 6V, R1 = 1k?, R2 = 2.5k? and R3 = 3.5k?, Rx = 10k? and the internal resistance of the galvanometer Rg = 300?. Calculate: i) ii) The amount current of current flow through the meter. The deflection of the galvanometer if its...If you want to scramble a full essay, shine out it on our website: Ordercustompaper.com

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