By John O'Malley

For better comprehension of circuit research, much less time spent learning, and higher attempt ratings, you cannot do higher than this strong Schaum's define! it is the most sensible learn instrument there's. It supplies thousands of thoroughly labored issues of complete suggestions at the details that you just really want to understand. enormous quantities of extra difficulties allow you to attempt your abilities, then cost the solutions. This accomplished learn consultant can be utilized with any textbook, yet it is so entire it really is perfect for self sustaining examine!

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**Extra resources for Schaum s outline of theory and problems of basic circuit analysis**

**Sample text**

3-20 find the total resistance R , with terminals a and 6 ( a ) open -circu it ed, and (6) short-circu i t ed . 16 52 14 52 352 952 Fig. 3-19 852 4052 10 52 Fig. 3-20 C H A P . 31 45 SERIES A N D P A R A L L E L DC CIRCUITS ( a ) With terminals a and h open, the 40- and 90-R resistors are in series, as are the 60- and 10-R resistors. 5 R + 90 + 60 +% (40 + 90x60 40 (b) For terminals a and b short-circuited, the 40- and 6 0 - 0 resistors are in parallel, as are the 90- and 10-R resistors. 43 T 40 x 60 = p 4 0 + 60 90 x 10 +------- 33R 9 0 + 10 A 90-A current flows into four parallel resistors having resistances of 5, 6 , 12, and 20 Q.

Since the voltage across resistors R , and R, is 50 V, there must be 100 - 50 = 50 V across R , . By Ohm's law, R , = 50,'2 = SERIES AND PARALLEL DC CIRCUITS [CHAP. 3 25 Q. Resistors R , and R , have 80 V across them, leaving 100 - 80 = 20 V across R , . Thus, R , = 20,2 = 1OQ. The resistance of R , is the total resistance minus the resistances of R , and R,: R , = 50 - 10 - 2 5 = 1 5 0 . 16 What is the maximum voltage that can be applied across the series combination of a 150-$2, 2-W resistor and a 100-0, 1-W resistor without exceeding the power rating of either resistor?

57 157 mS If an aluminum power line has a resistance of 80 R at 3 0 T , what is its resistance when cold air lowers its temperature to - 10cC? Ans. 56 29 RESISTANCE CHAP. 1 R Find the temperature coefficient of resistance of iron at 20'C if iron has an inferred zero resistance temperature of - 162°C. ' Ans. 60 What is the maximum current that a 1-W, 56-kR resistor can safely conduct'? Ans. 61 What is the maximum voltage that can be safely applied across a i-W, 91-R resistor? Ans. 18 R; ( h ) 5 percent, 39 kR; and (c) 20 percent, 20 MR?