University:
Boston University
Course:
ENG ME 302 | Engineering Mechanics II
Academic year:

2020
Views:

157

Pages:

15
Author:

larbiwxcvbn

Basic Circuits - Resistance Overview Boston Circuits Review University Slideshow Title Goes Here  Resistance and Resistors  Ohms Law  Breadboards  Capacitance  Experiments  Resistive Circuit  Voltage Divider  RC Circuit Recap - What is a Circuit? Boston InUniversity a circuit, how are the start and end related? Slideshow Title Goes Here  They’re the same!  What happens if there isn’t a continuous path?  Open Circuit – No flow of charge (or electrons)  What happens when a conduit connects two points?  Charge (and electrons) can flow between the points  Short Circuit – Directly connecting two points of different voltage  Switch  Device that can open or close a circuit Resistance Boston AsUniversity charge flows from high to low V, energy is released Slideshow Title Goes Here  Where does it go??  As electrons flow, they encounter resistance  Generate heat as a result of this opposition  Resistance is a function of material, length, and cross-sectional area  Resistance is measured in Ohms [Ω]  Wires have resistance, but it is minimal and a direct connection between different voltage levels is a short  The filament in an incandescent light introduces resistance  The heat energy causes the filament to “glow” white-hot and produce light Incandescent Light Resistors Boston University Slideshow Title Goes Here ?? ?? ?? Ohm’s Law  German professor who published a book in 1827 Boston University Slideshow Title Goes Here that includes what is now known as Ohm's law 𝑉 = 𝐼𝑅  Ohm's Law: Voltage across a resistor is directly proportional to the current flowing through it. + 𝑉 = 𝐼𝑅 - i𝐼 v R - +  The proportionality constant is the resistance! 𝑉 𝐼= 𝑅 Georg Simon Ohm (1789 – 1854) 𝑉 𝑅= 𝐼  What happens in the case of an open circuit (i.e., 𝑅 ≈ ∞)?  What happens in the case of a short circuit (i.e., 𝑅 ≈ 0)? Series vs Parallel V0  V1  V2  IR1  IR2  I  R1  R2  Boston Series Resistance University Slideshow Title Goes Here I  IRs + + A Rs V Rs  R1  R2 V2 R2 V0 I V1 R1 -  Parallel Resistance I  I  I  V  V  V  1  1   V   1 2 R1 R2 R R I Rp 2   1 I I1 V R1 I2 R2 V Rp 1 1 1   Rp R1 R2 Rp  R1 R2 R1  R2 Breadboards  Why do we use breadboards? Boston University Slideshow Title Goes Here  Temporary Circuits  Prototyping  No Soldering Anatomy of a Breadboard Boston University Slideshow Title Goes Here Schematics and Breadboards  Connect nodes of a schematic to a connected row of the breadboard Boston University Slideshow Title Goes Here Schematics and Breadboards  Connect nodes of a schematic to a connected row of the breadboard Boston University Slideshow Title Goes Here Boston University Slideshow Title Goes Here POSITIVE RESISTOR LED NEGATIVE SHORT EXERCISE 1. Copy the schematic. 2. Label where each of the numbers are. Boston University Slideshow Title Goes Here 1 8 7 6 2 3 4 5 Voltage Divider Circuit I Boston University Slideshow Title Goes Here R1 V1 R2 V2 V0 V0 I  Rs R1  R2 A V0 R1 Also V1  V0  R1  R2  V0 V2  IR2  R2  R1  R2  R2 V2  V0  R1  R2  Experiment I Boston Voltage Divider University Slideshow Title Goes Here  Resistive Circuits

Basic Circuits - Resistance

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