a 42 N 40 N 30 Ω 45 N b FIGURE P23.19 ww

you are trying to reduce the resistance in a branch of a circuit from 110 omega to 80 omega. You add a resistor to this branch of the circuit to make this change. What value of resistance should you use, and how should you connect this resistor ?

What is the equivalent resistance (in ohm) between points a and b in the diagram above if R1 = 80.0 Ω, R2 = 25.0 Ω, R3 = 65.0 Ω, and R4 = 40.0 Ω ?

Use mesh analysis to determine the three mesh currents in the circuit ? iz 3 0 7 V + 6 V iz

A 5 V battery of negligible internal resistance is connected across a 200 V battery and a resistance of 39 Q as shown in the figure. Find the value of the current 5 V 39 2 200 V

The figure below shows five resistors and two batteries connected in a circuit. What are the currents I,, I2, and I3? (Consider the following values: R, = 1.08 0, R2 = 2.20 0, R3 = 3.18 0, R4 = 4.04 0, R5 = 6.06 0. Due to the nature of this problem, do not use rounded intermediate values in your calculations-including answers submitted in WebAssign. Indicate the direction with the sign of your answer.) A A I3 = A Rs R3 12.0 V R2 9.00 V R1

A Wheatstone Bridge is used to determine the value of an unknown resistance R4 as shown in the diagram. The value of R2 is fixed at 22 Ω. The resistors shown as R1 and R3 are two parts of a uniform resistance wire. The bridge is balanced (i.e. no current flows through the voltmeter, V) when the length of wire corresponding to resistance R1 is 40 cm and the length of wire corresponding to resistance R3 is 60 cm. Calculate the value of the unknown resistance R4.

Consider the circuit shown in the figure below. (Assume R, = 15.5 N and R, = 3.50 N.) b 25.0 V R2 R2 R 20.0 N (a) Find the potential difference between points a and b. (b) Find the current in the 20.0-N resistor. A

What are the largest and smallest resistances you can obtain by connecting a 36 , a 55 , and a 2902 resistor together? Hint: How should you connect resistances so that the equilvalent resistance is larger than the indivudual resistances? Hint: How should you connect resistances so that the equilvalent resistance is smaller than each indivudual resistance? Rmax Rmin = = Ω Ω