Thursday, 18 August 2022

Week 4 Term 3 2022

Homework:

Act 17A, p.192-194, Electric Fields
Ex 6A, p.188-196, Static Electric Fields
Act 18A, p.201 Ohms and units
Act 18B, p.207 Resistors
Act 18C, p.209 Potential Dividers
Act 18D, p.211-213 V = IR Ohm's Law
Ex 6C, p.205-214 V = IR Ohm's Law
Act 19A, p.219-220 Magnets
Act 19B, p.223-225 F = BIL Lorentz
Act 19C, p.228 F = Bqv Lorentz
Ex 6D, p.218-220 F = BIL Lorentz
Ex 6E, p.222-224 F = Bqv Lorentz
Ex 6F, p.227-228 V = BvL Induced EMF
Act 20A, p.231-232 Induction
Act 20B, p.235-237 V = BvL Induction

Magnetic Fields

Magnets

Electromagnet

Earth & Compasses - Magnetism

Electromagnet Used for Scrap Metal Crane

Levitating with Electromagnets

Exploding Cans with Electromagnets

Magnetic Fields

Right Hand Screw Rule

Right Hand Slap Rule

Right Hand Slap (Palm) Rule

Lorentz Force (F = Bqv)

Lorentz Force

Lorentz Force (F = BIL)

V = BvL
Note:
emf is an old term for voltage and stands for electromotive force
E is also used by enginers for Voltage (not energy)

D.C. Motor

D.C. Motor How it Works

Brushless D.C. Motor How it Works

Faraday Cage

Tesla Coil & Faraday Cage

Wednesday, 3 August 2022

Week 2 Term 3 2022

Homework:

Act 17A, p.192-194, Electric Fields
Ex 6A, p.188-196, Static Electric Fields
Act 18A, p.201 Ohms and units
Act 18B, p.207 Resistors
Act 18C, p.209 Potential Dividers
Act 18D, p.211-213 V = IR Ohm's Law
Ex 6C, p.205-214 V = IR Ohm's Law

Current

Current is the rate of flow of Charge

I = Δq/Δt

Current

Voltage

Voltage (Potential Difference) is the change in energy (work done) to each coulomb of charge between two points on a circuit, or two points across an electric field

Circuit Symbols

Ohm's Law

Ohm's Law PhET application

D.C. Circuit Construction Kit PhET Application

D.C. Circuit Lab PhET Application

Ohm's Law

Series & Parallel Circuits

Electric Power

P = IV

P = I2R ← using Ohm’s Law V=IR substitution

P = V2/R←using Ohm’s Law I=V/R substitution

D.C. Motor How it Works?

Tuesday, 28 June 2022

Week 9 Term 2 2022

Homework:

Act 17A, p.192-194, Electric Fields
Ex 6A, p.188-196, Static Electric Fields

PhET - Charge & Electric Fields - App

Basics of Electric Charge

Definition of an Electric Field:

“Any region of space where a charge feels a force.”

A positive charge will feel a force with the electric field direction

A negative charge will feel a force against the electric field direction

Fe = Eq

Electric Field

Electric Potential (Voltage)

What is Voltage?

Uniform Electric Field

E = V/d

Uniform Electric Fields

Uniform Electric Field

E = V/d

E: Electric Field (Vm-1 or NC-1 depending on the context

used)

Electric Force

Fe = Eq

Fe: Electrical Force (N)

q or Q: Charge (C)

Electrical Potential Energy

As the charge falls through the Electric Field, the electrical potential energy transforms into kinetic energy.

Ek = Ep

½ mv2 = Vq

Electron Gun

(Cathode Ray Tube)

A Tube Screen TV is an Electron Gun

Cathode Ray Tube and how it works

Electron Gun

Cathode Ray Tube (CRT)

Discovery of the Electron: Cathode Ray Tube Experiment

Cathode Rays Leads to Thomson's Model of the Atom

Parker Solar Probe - Use of CRT

Millikan's Oil Drop Experiment

Charge of an Electron - Millikan's Oil Drop Experiment

Sunday, 22 May 2022

Term 2 Week 4 2022

Homework

Act 15A, p.173-176 Models of the Atom and Radioactivity
Ex 5A, p. 151-155 Models of the Atom
Ex 5B, p.160-171 Radioactivity

Study Pass Models of the Atom

Models of the Atom

History of the Atom

Models of the Atom Timeline

Discovery of the Electron: Cathode Ray Tube Experiment

Discovery of the Nucleus: Rutherford's Gold Foil Experiment

Charge of an Electron: Millikan's Oil Drop Experiment

Atomic Structure: Discovery of the Neutron

Parts of the Atom

Isotopes

Isotopes are versions of an atom or an element that have the same number of protons, but different numbers of neutrons

What are Isotopes?

Radioactive Decay

Alpha, Beta & Gamma Radiation

Alpha particles are emitted by a larger nucleus that has too many Protons
Beta particles are emitted by a nucleus that has too many Neutrons
Gamma photons are emitted by a nucleus that has too much Energy (is in an exited state)