DOC PREVIEW
UCF PHY 2054C - DIRECT CURRENT CIRCUITS - INTRODUCTION

This preview shows page 1-2-3 out of 10 pages.

Save
View full document
View full document
Premium Document
Do you want full access? Go Premium and unlock all 10 pages.
Access to all documents
Download any document
Ad free experience
View full document
Premium Document
Do you want full access? Go Premium and unlock all 10 pages.
Access to all documents
Download any document
Ad free experience
View full document
Premium Document
Do you want full access? Go Premium and unlock all 10 pages.
Access to all documents
Download any document
Ad free experience
Premium Document
Do you want full access? Go Premium and unlock all 10 pages.
Access to all documents
Download any document
Ad free experience

Unformatted text preview:

[DIRECT CURRENT CIRCUITS: INTRODUCTION – PART I]1 | P a g eSTUDIO Unit 06PHY2054 - College Physics IIUNIT 6 - DIRECT CURRENT CIRCUITS Part I(modified from Lillian C. McDermott and the Physics Education Group, Physics by Inquiry Volume II,John Wiley and Sons, NY, 1996Also includes material from Dr. Thacker)Objectives- to understand the concept of a closed circuit - to understand how conductors and insulators behave in a circuit- to be able to draw circuit diagrams for physical circuits- to be able to set up physical circuits from circuit diagrams Equipment:1 battery1 light bulb1 flashlight1 10cm piece of wire (stripped at both ends or may have clips)1.1 a. Obtain one battery, one light bulb and one wire. Connect these in as many ways as youcan. Specifically: find four arrangements that light the bulb and four arrangements that donot light the bulb. Sketch all of the arrangements. 2 | P a g eb. State what requirements must be met in order for the bulb to light.c. Examine the flashlight. What requirements must be met in order for the bulb to light?d. The term closed circuit is used for arrangements that light the bulb. Explain why this isa reasonable terminology by discussing how the elements in the circuit must beconnected in order to light the bulb.3 | P a g eEquipment:1 battery1 light bulb1 large bulb with glass removed2-3 10cm piece of wire (stripped at both ends)different materials for wire: Copper, pencil and Nichrome2.1 a. Obtain a battery, bulb, two wires and objects made out of different Insert the objectsinto the circuit. Observe what happens to the bulb when each of the objects is inserted.Classify the objects according to their effect on the bulb. Objects that allow the bulb to glow brightly are called conductors. Objects that make thebulb to go out are called insulators. Some objects lie between the two categories.b. Obtain a large light bulb with the glass removed. Use a test circuit (battery, small bulband wire(s)) to determine where the two wires coming up from inside the base of the bulb4 | P a g eoriginate. Which parts of the bulb are conductors and which parts of the bulb areinsulators? Be careful of sharp edges and be aware that previous student interactions haveleft some of the bulbs in need of hospitalization. Nevertheless, you should be able tofigure things out! SKETCH THE STRUCTURE HERE:Equipment:1 battery1 battery holder1 switch1 light bulb1 light socket4-5 alligator clip wires3.1 Obtain a battery, bulb, wires with alligator clips, battery holder, socket, and a switch.a. Using a battery, a battery holder, a bulb, a socket, and two wires, set up a circuit thatlights the bulb. Trace the path of the conductors around the circuit. Sketch your circuithere.b. Connect the battery (in a holder), bulb (in a socket) and switch in such a way thatclosing the switch lights the bulb. Sketch.This is called an open circuit when the switch is open. Discuss why the bulb doesn’t lightwhen the switch is open. 5 | P a g e4.1 Circuit diagrams. Circuit diagrams let us represent a circuit on paper by using common symbols for thebatteries, bulbs, switches and other circuit elements. We will use the following symbolsfor circuit elements: Circuit diagrams show electrical connections and not physical layout. The two circuits,(1) and (2), shown below, are represented by the same circuit diagram (3).The statement that circuit diagrams show electrical connections means that they showwhich end of each element is connected to the ends of other elements. More than oneother element may be connected to each end of an element, but connections can only bemade to an end of an element. It may be useful to label the ends of each element. Forexample, a bulb could be labeled and the above diagram could be labeled6 | P a g ea. Consider the following physical circuits. Draw circuit diagrams for each of the circuitspictured.7 | P a g eb. Consider the following student circuit diagrams. Set up the circuits represented. If youcannot set up the circuit represented by a diagram, explain what about the diagram isincorrectly drawn.As you have seen, it is possible to connect batteries and bulbs in different ways. Whetheror not the bulbs in a circuit will light, and the magnitude of their brightness, depends onhow they are connected. We would like to be able to predict the brightness of bulbs in acircuit, if we know how they are connected. In order to do this, we have to develop amodel, based on our experimentation, which will allow us to predict the brightness ofbulbs in many different circuits. We will do this in the next sections.8 | P a g eSUMMARY SO FARYou should be able to understand the concept of a closed circuit. You shouldunderstand how conductors and insulators behave in a circuit. You should be able todraw circuit diagrams for physical circuits and be able to set up physical circuitsfrom circuit diagrams.IMPORTANT DEFINITION:The amount of charge per unit time passing a cross-sectional area of a wire is calledcurrent. The symbol for current is I. Mathematically, tQIThe unit of current is the Ampere (A). One Ampere is equal to one Coulomb per second:1A = 1C/s.9 | P a g eNOTES:10 | P a g


View Full Document

UCF PHY 2054C - DIRECT CURRENT CIRCUITS - INTRODUCTION

Download DIRECT CURRENT CIRCUITS - INTRODUCTION
Our administrator received your request to download this document. We will send you the file to your email shortly.
Loading Unlocking...
Login

Join to view DIRECT CURRENT CIRCUITS - INTRODUCTION and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view DIRECT CURRENT CIRCUITS - INTRODUCTION 2 2 and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?