ECE 345 Lecture Notes - Lecture 4: Ohmmeter, Ammeter, Voltmeter

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Lecture 4 (2. 6, 2. 8) (cid:1)(cid:2)(cid:3)(cid:4)(cid:3)(cid:5)(cid:6)(cid:7)(cid:8)(cid:2)(cid:9)(cid:6)(cid:7)(cid:10)(cid:9)(cid:11)(cid:12)(cid:13)(cid:14)(cid:3)(cid:9)(cid:15)(cid:6)(cid:16): the circuit symbol, element constraints, and (cid:1)#(cid:2) characteristics for a resistor are shown below. (cid:4)(cid:2) (cid:3)(cid:1) (cid:4)(cid:1) = (cid:2) (cid:3) Symbol (cid:5)(cid:6)(cid:7)(cid:8)(cid:9)(cid:10)(cid:11): (cid:22)(cid:23)(cid:19)(cid:4)(cid:24)(cid:6)(cid:25)(cid:2)(cid:7)(cid:5)(cid:9)(cid:1)(cid:2)(cid:3)(cid:4)(cid:3)(cid:5)(cid:6)(cid:7)(cid:8)(cid:2): when the (cid:1)#(cid:2) characteristics at the terminals of two different circuits are identical, then the two circuits are said to be equivalent. Series resistance: two or more circuit elements are in series if the current from one element exclusively flows into the next element. The equivalent resistance of resistors connected in series is the sum of the resistances. (cid:3)1 (cid:2)1 (cid:3)2 (cid:2)2 (cid:3)3 (cid:2)3. By kirchhoff"s voltage law (kvl), and using ohm"s law: (cid:2) (cid:6) (cid:2) 1 (cid:14) (cid:2) (cid:14) (cid:2) (cid:6) (cid:3)(cid:1)(cid:3)(cid:1) (cid:6) 3 (cid:1) (cid:3) (cid:12) (cid:1) (cid:6) (cid:2)(cid:12) (cid:3)(cid:12) (cid:3) (cid:14) (cid:3)(cid:1) (cid:6) (cid:11)(cid:13) (cid:12) The (cid:1)(cid:6)#(cid:2)(cid:6) characteristics at terminals a#b are the same as in figure 2. 3 (cid:14)th series resistor: (cid:2) (cid:6) (cid:3) (cid:11)(cid:13) (cid:3)

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