Chapter 3 Ese Electrical Measurement(Bridges)

CHAPTER 3 BRIDGES 3.1. Introduction A twosome consists of four-spot impedance fortify forming a closed electrical roundabout, a voltage source and a true detector coherent as in haoma 3.1. links rat be classified into two types: i) ii) DC Bridge AC Bridge DC connect are employ for accurate measurement of resistance while ac braces are use to measure inductance and capacitance. intent 3.1: A link up circuit 3.2. Wheatstone Bridge Wheatstone bridge is the most accurate method for measuring stick resistance and is popular for laboratory used. It consists of 4 resistors, a dc voltage source and a galvanometer arranged as shown in approach pattern 3.1 The galvanometer is used to detect the on-going function from dose A to B. M. Khusairi Osman  page 60  Figure 3.2: radical circuit diagram for a Wheatstone bridge A bridge is state to be in balance condition (null condition) if thither is no current flows by means of the galvanometer ( Ig = 0).         congresswoman: Refer to Figure 3.2. If Vin = 5V, R1 = 10k?, R2 = 15k? and R3 = 40k?, determine the value of Rx if the bridge is in balance condition. reply: ? M. Khusairi Osman  Page 61   A bridge is said to be unbalance condition if there is current flows by means of the galvanometer ( Ig ? 0).

The amount of current flowing through the galvanometer can be determined using Thevenins uniform circuit. Refer to Figure 3.3 Figure 3.3 // // Then, Ig can be determined as: Where Rg is the inside resistance of the galvanometer. The total refraction of the galvanometer, D can be de! termined 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. Given Vin = 6V, R1 = 1k?, R2 = 2.5k? and R3 = 3.5k?, Rx = 10k? and the internal resistance of the galvanometer Rg = ccc?. Calculate: i) ii) The amount current of current flow through the meter. The deflection of the galvanometer if its...If you want to get a full essay, come out it on our website: OrderCustomPaper.com

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