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====Node rule====
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*[[Node Rule]]
====The Main Idea====
*'''Mathematical Model'''
**In this image, you can see what our equations are based on: [[File:noderule.jpg]]
**The node rules can be written as I_total = I_1 + I_2 and I_total = I_3 + I_4. It is also true that I_1 + I_2 = I_3 + I_4.
**However, each of these currents are different because each point has a different resistance. The current is different for each because it is equal to V/R, and in a parallel circuit, the voltage drop across each point is equal.
**An easy way to know when to use node rule is by seeing if there are three connections or more. That is when node rule is most helpful.
*'''Computational Model'''
**In an electric circuit in series, electrons flow from the negative end of a power source, creating a constant current. This current remains consistent at each point in the circuit in series. Sometimes, a circuit is not simply one constant path and may include parts that are in parallel, where the current must travel down two paths such as this:
**[[File:noderule.jpg]]
**In this case, when the current enters a portion of the circuit where the items are in parallel, the total amount of current in must equal the total amount of current out. Therefore, the currents in each branch of the parallel portion must sum up to the amount of current at any other point in series in the circuit.
**People also call this the "Junction Rule"
**Another important point is that this comes from the Kirchoff's Circuit Laws
====Examples====
*'''Simple'''
**Here is an example of a simple circuit problem: [[File:SimpleNodeRule.jpg]]
*'''Medium'''
**Here is an example of a medium circuit problem: [[File:MediumNodeRule.jpg]]
*'''Difficult'''
**Here is an example of a difficult circuit problem: [[File:DifficultNodeRule.jpg]]
====Connectedness====
*'''To other topics:'''
**Many times when you use Node Rule you will also use the Loop Rule. The Loop Rule states that the sum of voltage will equal zero. So using this concept and the Node Rule, you are usually able to figure out missing variables in circuit problems.
*'''To majors:'''
**Node rule is important in all and any major. More specifically, electrical engineering because of the constant need to look, analyze, and understand circuits. However, in general, any major that involves some sort of circuitry will need this. It is the basis to making an effective circuit.
*'''To industrial application:'''
**If you go into robots, engineering, or really anything that involves wires and batteries. You will need to know this.
====History====
*Basic History
**Gustav Kirchoff was the man who discovered this rule while studying electrical currents. He was also the first person to confirm an electrical impulse moves at the speed of light.
====External Resources and Information====
*Sources like Khan Academy and simple YouTube searches can be very helpful in learning more about this topic.
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====Electric fields and energy in circuits====
====Electric fields and energy in circuits====
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Revision as of 16:03, 18 April 2018

Georgia Tech Student Wiki for Introductory Physics.

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All of the content added to this resource must be in the public domain or similar free resource. If you are unsure about a source, contact the original author for permission. That said, there is a surprisingly large amount of introductory physics content scattered across the web. Here is an incomplete list of intro physics resources (please update as needed).

  • A physics resource written by experts for an expert audience Physics Portal
  • A wiki written for students by a physics expert MSU Physics Wiki
  • A wiki book on modern physics Modern Physics Wiki
  • The MIT open courseware for intro physics MITOCW Wiki
  • An online concept map of intro physics HyperPhysics
  • Interactive physics simulations PhET
  • OpenStax intro physics textbooks: Vol1, Vol2, Vol3
  • The Open Source Physics project is a collection of online physics resources OSP
  • A resource guide compiled by the AAPT for educators ComPADRE
  • The Feynman lectures on physics are free to read Feynman

Resources


Physics 1

Week 1

Help with VPython

Vectors and Units

VPython

Vectors and Units

Interactions

Velocity and Momentum

Week 2

Momentum and the Momentum Principle

Iterative Prediction with a Constant Force

Week 3

Analytic Prediction with a Constant Force

Iterative Prediction with a Varying Force

Week 4

Fundamental Interactions

Main Idea

Week 5

Conservation of Momentum

Properties of Matter

Week 6

Identifying Forces

Curving Motion

Week 7

Energy Principle

Week 8

Work by Non-Constant Forces

Potential Energy

Week 9

Multiparticle Systems

Week 10

Choice of System

Thermal Energy, Dissipation and Transfer of Energy

Rotational and Vibrational Energy

Week 11

Different Models of a System

Models of Friction

Week 12

Collisions

Week 13

Rotations

Angular Momentum

Week 14

Analyzing Motion with and without Torque

Week 15

Introduction to Quantum Concepts

Physics 2

Week 1

3D Vectors

Electric field

Electric force

Electric field of a point particle

Superposition

Dipoles

Week 2

Interactions of charged objects

Tape experiments

Polarization

Week 3

Insulators

Conductors

Charging and discharging

Week 4

Field of a charged rod

Field of a charged ring/disk/capacitor

Field of a charged sphere

Week 5

Potential energy

Electric potential

Sign of a potential difference

Potential at a single location

Path independence and round trip potential

Week 6

Electric field and potential in an insulator

Moving charges in a magnetic field

Biot-Savart Law

Moving charges, electron current, and conventional current

Week 7

Magnetic field of a wire

Magnetic field of a current-carrying loop

Magnetic field of a Charged Disk

Magnetic dipoles

Atomic structure of magnets

Week 8

Steady state current

Kirchoff's Laws

Electric fields and energy in circuits

Macroscopic analysis of circuits

Week 9

Electric field and potential in circuits with capacitors

Magnetic forces on charges and currents

Electric and magnetic forces

Velocity selector

Week 10

Hall Effect

Motional EMF

Magnetic force

Magnetic torque

Week 12

Gauss's Law

Ampere's Law

Week 13

Semiconductors

Faraday's Law

Maxwell's equations

Week 14

Circuits revisited

Inductors

Week 15

Electromagnetic Radiation

Sparks in the air

Superconductors

Physics 3

Week 1

Classical Physics

Week 2

Special Relativity

Week 3

Photons

Week 4

Matter Waves

Week 5

Wave Mechanics

Week 6

Rutherford-Bohr Model

Week 7

The Hydrogen Atom

Week 8

Many-Electron Atoms

Week 9

Molecules

Week 10

Statistical Physics

Week 11

Condensed Matter Physics

Week 12

The Nucleus

Week 13

Nuclear Physics

Week 14

Particle Physics

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