Practice problemsmm mmm-29.For thecircuit shown in Figure 20-39, determi 25. Fin

Question

Practice problemsmm mmm-29.For thecircuit shown in Figure 20-39, determi 25. Find the equivalent resistance of the circuit shown e - a. the current in each resistor in Figure 20-36. (See Sample Problem 20C.) b. the potential difference across each resisto See Sample Problem 20D.) 30.0 V 6.0 18 9.0 6.0 9.0 12 Figure 20-36 12 V 3.0 Figure 20-39 26. Find the equivalent resistance of the circuit shown in Figure 20-37 (See Sample Problem 20C.) 7.0 7.0 12.0 V 7.0 1.5 7.0 R5 27. Two identical parallel-wired strings of 25 bulbs are Figure 20-37 connected to each other in series. If the equivalent resistance of the combination is 150.0 when it is connected across a potential difference of 120.0 V what is the resistance of each individual bulb? (See Sample Problem 20C.) 28. For the circuit shown in Figure 20-38, determine the following: a. the current in the 2.0 resistor , the potential difference across the 2.0 resistor c. the potential difference across the 12.02 resistor d. the current in the 12.0 resistor (See Sample Problem 20D.) 6.0 3.0 6.0 3.0 12.bs2-wr 18.0 V 756 Chapter 20

Explanation / Answer

26] R2 and R3 are in series and so their sum will be:

R = 7 + 7 = 14 ohms

this is parallel to a 7 ohm resistor

so, their equivalent resistance will be:

R' = [1/14 + 1/7]-1 = 4.667 ohms

this is now in series with one 7 ohm resistor and another 1.5 ohm resistor. So, the equivalent resistance of the circuit is:

Req = 4.667 + 1.5 + 7 = 13.167 ohms.

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