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Recent questions tagged telegram-5334

(chatquestion)...nce. R R R, R [3.83(a)] This last equation relating the four resistors is called the balance adition for the galvanometer to give zero or null deflection. The Wheatstone bridge and its balance condition provide a practical thod for determination of an unknown resistance. Let us suppose we re an unknown resistance, which we insert in the fourth arm; R is at known. Keeping known resistances R, and R, in the first and d arm of the bridge, we go on varying R, till the galvanometer shows l delection. The bridge then is balanced. and from the balance ition the value of the unknown resistance R, is given by, R R, =R, [3.83(b) R A practical device using this principle is called the meter bridge. be discussed in the next section. Example 3.8 The four arms of a Wheatstone bridge (Fig. 3.26) have the following resistances: AB = 1002, BC = 102, CD = 52, and DA = 602. 1-I 1000 109 152 602 I+I, 10V FIGURE 3.26

asked Feb 26, 2020 by balaji.thirumalai

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