Term 3 Week 8 2016

Homework

• Questions 1-7, p.128-132 Simple Induction
• Question 9, p. 136 Transformers

Inductance

Inductor PhET Demonstration

Term 3 Week 7 2016

Homework

• Ex 7, p.120 -124, Capacitors
• Questions 1-7, p.128-132 Simple Induction
• Question 9, p. 136 Transformers

Transformers

The ratio of the secondary to primary voltage is equal to the ratio of the secondary to primary turns

Vs/Vp = Ns/Np

In an Ideal Transformer 

Secondary Power = Primary Power

In reality, energy is lost through heat from eddy currents generated in the soft iron core from the changing flux.

NB: As Voltage is often referred to as e.m.f. the Symbol "e" or "E" is often used in engineering to refer to e.m.f.

This is the case in the video below.

After explaining how basic Transformers work, this video goes on to explain 3-Phase Transformers.

NZ Street Step-Down Transformer

Internal Diagram of a Transformer

Faraday Cage

Tesla Coil & Faraday Cage

Tesla Coil & Faraday Cage

Exploding Cans with Electromagnets

Levitating with Electromagnets

Term 3 Week 6 2016

Term 3 Week 6 2016

Homework

• Ex 7, p.120 -124, Capacitors
• Questions 1-7, p.128-132 Simple Induction

Right Hand Screw Rule

Right Hand Slap Rule

Magnetic Flux

Lenz's Law

Faraday;'s Law & Lenz's Law