Term 3 Week 5 2017

Homework:

• Ex 6C, p.205-214, Series & Parallel Electric Circuits - V = IR

Resistors in Series - Calculating Voltage, Current & Resistance

Resistors in Series

Resistors in Parallel - Calculating Voltage, Current & Resistance

Resistors In Parallel

Resistors in Series vs Parallel

Resistors in Combination - Series & Parallel Resistors - Part 1

Resistors in Combination - Series & Parallel Resistors - Part 2

Resistors in Series - Calculating Equivalent Resistance

Resistors in Series - Calculating Current

Resistors in Series - Calculating Voltage

Resistors in Parallel - Calculating Voltage

Resistors in Parallel - Calculating Current

Resistors in Parallel - Calculating Equivalent Resistance

Term 3 Week 4 2017

Homework:

• Ex 6A, p.188-196, Electric Fields
• Ex 6B, p.200-201, Current & Voltage
• Ex 6C, p.205-214, Series & Parallel Electric Circuits - V = IR

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

Ohm's Law

Series & Parallel Circuits

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

Term 3 Week 3 2017

Homework:

• Ex 6A, p.188-196, Electric Fields

Cathode Ray Tube - Electron Gun

Cathode Ray Tube - Electron Gun

Discovery of the Electron: Cathode Ray Tube Experiment

Cathode Rays Lead to Thomson's Model of the Atom

Millikan's Oil Drop Experiment

Charge of an Electron - Millikan's Oil Drop Experiment

Term 3 Week 2 2017

Homework:

• Ex 3A, p.47-52, Refraction
• Ex 6A, p.188-196, Electric Fields

PhET application on Charge & Electric Fields

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 Fields

Electric Potential (Voltage)

Uniform Electric Field

E = V/d

Term 3 Week 1 2017

Homework:

• Ex 3A, p. 47-52, Refraction

Snell's Law & Critical Angle

The Critical Angle occurs when a wave is attempting to pass from a medium with a slower speed to that of a higher speed low v → higher v

low 𝜆 → higher 𝜆

high n → lower n

The Critical angle is the incident angle where the refracted angle equals 90 degrees

Any incident above the Critical angle will prevent any refraction occuring and Total Internal Reflection will occur

The Critical angle is can be found by sin(𝜭c) = n2/n1

Snell's Law

FibreOptic Cables: How they work?

Term 2 Week 10 2017

Homework

• Ex 3C, p. 56-63 Lens
• Ex 3A, p. 37-44 Curved Mirrors

Refraction

v1/v2 = 𝛌1/𝛌2 = sin(𝜭1)/sin(𝜭2) = n2/n1

Wave Refraction

n1sin(𝜭1) = n2sin(𝜭2)

Snell's Law (for Light Only)

PhET Refraction application

Apparent position of an object underwater

Refraction of Waves

Snell's Law