# Lab 8 Series Circuits

 Lab #: Lab #8 Title: Series Circuits Date Performed: Oct 11th, 2018 Course: ECET 201-001
 Percent Contribution Lab Partner Pre-lab Lab Session Report Joe Velasquez Warren Mitchell Totals 100 100 100

Abstract: Resistance is the opposition to free flow or motion of any substance. The electric component used either to limit current through an active component to reduce voltage in the circuit is a resistor. The calculated percentage error for each resistors was within the range of the tolerance – 5 percent.

Introduction: The objective of this lab experiment is to introduce Series Circuits. We will learn how to construct several resistors in series to the voltage source and at the end of the experiment, we will calculate the Total Resistance when they are in series. We will also measure the current across each element and determine whether the measured values are equal to the calculated values. The goal of this experiment is to be familiar with building and measuring series circuits.

Simulation: We did not use the computer program multisim for this lab, so there was no simulation besides for the experiment.

Experimental: Construct series circuits using different combinations of  wires, and resistors. Observe the effects of an electric current. Compare the observations from different trials to discover how relationships are affected by changing one or more resistors. Classify and analyze observations in the chart below.

Results and Discussions:

joe insert chart and results here

Questions for lab #8:

1.)     If the measured value of Rt did not equal the sum of the individually measured resistance, you might conclude that

A:  ( C )  the ohm meter measurements are subjected to some error.

• Three resistors of Value 1k , 2k , and 3k each having a tolerance of +/- 5 percent , are series-connected circuit such as that in figure 8-1 is the same.

A: (B) 1.67mA

• The current through each resistor in a series-connected circuit such as that in figure 8-2 is the same.

A: (A) TRUE

• IF the resistors tolerance is in the experiment had been +/- 10 percent , the maximum current through each series combination with 10V source would have been

A:  ( D ) 667 mA

• If any resistors in a series circuit are reduced in value, the total current will increase. Explain why this is.

A:  take a look at ohms law, if we decrease the resistance the current will be higher.

6:) If two resistors in a series circuit suffer a change in resistance such that one increased by 10 percent and the other decreased by 10 percent. Explain why the circuit will not necessarily stay constant. Under what conditions would the current undergo no change ?

A:

Conclusions:

References:

Books or Magazines:  Brian H. Stanley, experiments in electric circuits, Pearson 9th ed., 2009, pgs. 41-44

 Score Weight Item Cover Page (3 percent) 1 Lab number and name 1 Date performed 1 Team members 2 Table of Contents (2 percent) Introduction (5 percent) 2 Lab station number or list of test equipment with model and serial numbers 3 Lab objectives Body (40 percent) – separate section for each circuit 10 Circuit title and function 20 Measured response – including all the data required in the lab write-up 15 Comparison of the theoretical and measured responses – either plotted on the same chart if they are curves or showing the per cent difference if they are individual points. 15 Discussion – with answers to the questions and a credible explanation of any significant variations General (30 percent) 10 Grammar, spelling, and punctuation 10 Plot format – independent variable on the x-axis, dependent variables on the y-axis, legible data points and curves, labeled axes with units, linear or log scales as appropriate, figure numbers and captions 10 Table format – appropriate number of significant digits, clear column headings, appropriate column widths and row heights, table numbers and captions 100 Total

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