EXPERIMENT 2

Measure the actual value of each resistor and record in Table 2.1  

PART A Construct the circuit shown in Fig. 2.1

CONNECTIONS 330 300 1.8 k 2.7 k 3 k

Commence at point A and measure the potential difference between each successive pair of lettered terminals for Mesh 1. i. e. A-B, B-C, C-D and D-A. (Note: DMM’s probes have to be placed consistently.) Record down the measured values in Table 2.2. A B

Reference points Measured Values Theoretical Values Potential Difference (V) Sign (+ or -) A-B    0.739 V - B-C 7.964 V C-D  10 V  + D-A  1.297 V - 

A C Measure the potential difference for the points AC, CE and EA. Verify Kirchhoff’s voltage law using the displayed values. (Note that VCA is actually VC – VA). What can be deduced from this condition? Record the measured values in Table 2.3.

Potential Difference (V) Reference points Measured Values Theoretical Values Potential Difference (V) Sign (+ or -) A-C   8.703 V  - C-E  9.245 V + E-A  0.542 V Measure the potential difference for the points AC, CE and EA. Verify Kirchhoff’s voltage law using the displayed values. (Note that VCA is actually VC – VA). What can be deduced from this condition?

x y z PART B Measure the branch currents entering node A by placing ammeter as shown in Fig. 2.1. Record the magnitude and the direction of the current as indicated by each ammeter in Table 2.4.

300 1.8 k 330 2.7 k 3 k 300

300 330 1.8 k 2.7 k 3 k 300

Resistance Current Current direction R3 -1.806 mA  Going out R4 - 0.432 mA Going out  R6 2.238 mA  Going into x y z