A 3 ? resistor is connected in parallel to a 6 ? resistor and this combination i

Question

A 3 ? resistor is connected in parallel to a 6 ? resistor and this combination is in series to a 4 02 resistor. If a 12 volt battery is connected across this network, what is the current in the 3 ?resistor? a. 0.67 A b. 1.33 A 11. Two resistors of 10-Ohm and 20-Ohm are connected in parallel across an ideal source of 20 V. The current supplied by the source is a. 1.0A b. 2.0 A c. 3.0 A d. 4.0 A 12. The sum of the currents entering any junction must be equal to the sum of the currents leaving that junction. This is a statement of a. Coulomb's law c. Kirchhoff's current law b. Ohm's law d. Kirchhoff's voltage law PROBLEMS/QUESTIONS: Solve the following problems. You must show your work. 1. In the figure at the right, the ideal batteries have emfs i- 12 v and €2-60 V. Resistors RF4 ? and R2= 8 ?. Find Ez a. the current I a. b. the dissipation rate in R c. the dissipation rate in R2 C. d. The net energy transfer rate in the batteries d.

Explanation / Answer

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10.

equivalent resistance

1/R =4+(1/3 + 1/6)-1

R=6 ohms

Total current

I=V/R =12/6 =2 A

Voltage across 4 ohms is

V4=2*4 =8 V

Voltage across 3 ohms resistor is

V3=12-8=4 V

Current through 3 ohms is

I3=4/3 =1.33 A

11.

equivalent resistance

1/R =(1/10 +1/20)

R==6.667 ohms

Total current

I=V/R=20/6.667=3 A

12.

Kirchoff's current law

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