Question

HOMEWORK FOR LAB 7 KIRCHHOFF'S CIRCUIT RULES Find the equivalent resistance of the followine etwock. Alles in ohms.) Show your work below. 1. network (All resistances are potential 2. Show on the circuit diagram in Question 1 how you would connect a mu meter to measure the current through the 8-n resistor a. Explain why the multimeter is connected in this way. has a low vesitity so it would difference. b. What characteristic of a good multimeter allows you to connect it in the way you indicated without appreciably affecting the current through the 8-12 resistor? So it would make no 3. Show on the circuit diagram in Question 1 how you would connect a multi- meter to measure the voltage across the 8- resistor. a. Explain why the multimeter is connected in this way. b. What design feature of a good multimeter allows you to connect it in the way indicated without appreciably affecting the voltage across the 8-0 resistor? 12V 10P HWE 4. A battery with emf 12 V and internal resistance 1 Nis pictured in the thick-lined box in the circuit on the right. A is the positive terminal of the battery and Bis the negative terminal S 150 a. What is the potential difference across the battery's terminals when the switch S is open, as shown? LAB 7: KIRCHHOFF'S CIRCUIT RULES

Answer 1

(1) the equavalent resistance of upper branch

first two resister in series so

R10 = 10 + 10

R10 = 20Ω

this is connected with 20 ohm in parallel connection so

R10,20 = 3

R10,20 = 102

so this connects with 20 ohms in series so

R = 20 + R 10.20 = 20 + 10

R = 3022

for lower branch

20 * 30 Ri= 10 + 20 + 30 +30 +8

R = 302

now upper and lower branch in parallel connection so

Reg = 30/22

Reg = 1592