Term 3 Week 7 2019

Homework

Ex 6A, p.251-254 Level 2 D.C. Circuit Revision

Ex 6B, p.261-261 Internal Resistance of a Battery

Ex 6C, p.267-272 Kirchhoff's Laws

Ex 6D, p.277-280 Capacitors Ep = ½ QV

Ex 6E, p.283-284 Capacitors C = 𝜺r𝜺oA/d

Ex 6F, p.289-292 Capacitor Networks (Series & Parallel)

Ex 6G, p.298-300 Capacitor Charge & Discharge

Ex 6H, p.303-305 Inductance in D.C. Circuits

Ex 6I, p.308-310 Inductors Charge & Discharge

Ex 6J, p.311-312 Transformers

Right Hand Screw Rule

Right Hand Slap Rule

Magnetic Flux

Faraday's Law - PhET Application

Lenz's Law

Faraday;'s Law & Lenz's Law

Inductance

Inductor PhET Demonstration

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

Exploding Cans with Electromagnets

Levitating with Electromagnets