College of Engineering

Circuits Lab Introduction

Engineering Education Innovation Center

ENGR 1181

Lab 3 – Alternative Powerpoint (authored by Bruce Trott)

Lab Safety

ENGR 1181

Lab Rules• Closed Toed Shoes• No food or drink• Instructor/TA checking

before testing• Turning off/on Breadboard• Checkout Sheet Signed

P. 3

Task 1: Basic Setup (Step 1) • Connect 5V power supply to the toggle switch box by plugging in the black wire• Next connect the red and black wires originating from the bread board sockets to their appropriate positions as shown:

5 V power supply

Notice Red and Black wires connectingfrom +5V and GroundPosts. Make sure metal part of wires are touching metal posts.

Task 1: Basic Setup (Step 2) • Connect the red and black probes to their appropriate Digital Multimeter (DMM) connections as shown in the figure below :

P. 4

Turn the DMM dial to the DCV setting to configure it as a voltmeter

This is the standard configuration of Leads

Converting from Schematic to Physical

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Follow the Diagram

+5 Volts+5 Volts

Ground

Physical Layout

Circuit Schematic

+5 Volts

Ground

+5 Volts

Ground

Schematic

P. 6

Task 3: Series Circuit, (Step 1)• Toggle off power to board.• Place the nominally valued 200 and 300 Ohm resistors on the Breadboard, as shown in the schematic (left) and in the picture (right).NOTE: Vertical location of resistors is critical.

Circuit Schematic

23

An Equivalent Circuit

P. 7

•Different physical circuits can correspond to same logical circuit•An example of the same circuit in a different physical layout

Do you now understand the concept of metal strips?

Common Problems

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• Misaligning resistors and wires

• Not using calculated values for resistances

• Not adding a resistor within the LED Circuit

• Miscalculations

• The power strip isn’t on • Ground the circuit• 3) LED are placed backwards (Short lead to ground)• 4) Halves of the boards aren’t being bridged• 5) Wires are missing from the main 5V power source

*Never measure CURRENT using the DMM. The current should always be calculated from measured voltage and resistance values.

More Common Problems

Two - Person Teams

ENGR 1181

Perform this lab in teams of 2 people.

If there are only 3 people, all can work together.

Record results in provided calculation sheet

and perform calculations.

• ENG 1181

Topic Document Type

Marble Delivery System None

Quality and Productivity Executive Summary

CIRCUITS EXECUITIVE SUMMARY

Solar Meter --

Solar Cell Memo (Combined)

Quality & Productivity Memo

Wind Turbine 1 --

Wind Turbine 2 Report (Combined)

Problem Solving Project 1

Project Notebook (Combined)Problem Solving Project 2

Problem Solving Project 3