ENGINEERING-43
Series-Parallel Circuits
Lab-06 /

Lab Data Sheet – ENGR-43 Lab-06

Lab Logistics

Experimenter:
Recorder:
Date:
Equipment Used (maker, model, and serial no. if available)

Directions

  1. Check out a DMM.
  1. Go to the side counter, collect resistors, “bread board”, and leads required to construct the circuit shown in Figure 1.
  1. Make the DMM-Measurements[1] and Calculations needed to complete Table I
  • Measure RT, the total circuit resistance, by removing the power supply, and applying in the ohmmeter probes across the input & output circuit connections.
  • Calculate RT using two different methods
  • By the Series-Parallel calculation from the individually measured resistances
  • By V/I using the measured values of Current & Voltage
  • The experimenter must determine WHICH I & V to use in this calculation
  1. Return all lab hardware to the “as-found” condition

NOTE

The Ammeter MUST be connected in series with NO potential across it; i.e., do NOT connect the ammeter ACROSS Vs or any R.

Figure 1 • Series-Parallel Circuit.
- Vs = 10.00 Vdc.
- R1 = 0.8-4 kΩ = R2 = 0.8-4kΩ = R3 = 0.8-4 kΩ. R4 = 1.2-9 kΩ.
- R1, R2, R3 to have the SAME nominal (color-coded) value.
- The R1,2,3:R4Resistance RATIO to be in the range of 1.5-6

.

© Bruce Mayer, PE • ChabotCollege • ENGR-43_Lab_06_070202.doc • Page 1

  • Actual Values

Vs =
R1 =
R2 =
R3 =
R4 =

Table I– Full Circuit Characterization

Value Determination / RT (note1) / RT (note2) / VR1 / VR2 / VR3 / VR4 / I1 / I23 / I4
Calculated
Measured
%
  • Note1: Calculate by Series-Parallel combinationusing the Actual Values for resistors R1-R4as determined by OhmMeter measurement
  • Note2: Calculate using appropriate I & V measurements
  • % calculation
  • % = 100x(Valuecalc – Valuemeas)/Valuemeas

Run Notes/Comments

© Bruce Mayer, PE • ChabotCollege • ENGR-43_Lab_06_070202.doc • Page 1

[1] CAREFULLY Select the DMM range such that meter displays at least FOUR (4) digits. All DMM measurements should be reported to 4 significant figures