Practical Lesson

Faraday's Law (Maths) & Lenz's Law (Physical) Follow link for a print out of the class work sheet.

HSC can understand moving conductors in magnetic field by considering that this creates a conventional current as protons are moved and an opposing current as electrons are moved. This forces the charges appart creating a battery.

This is a good animated summary of the topic.

Lenz'z Law and more

Complete to Q 23 P 128, Summarize Chapter 7

Lenz's Law current is generated make an pole that resists motion.

Push N to N, Pul N to S

The fields at the same so in a transformer more turns x less current, of less turn x more current. More turns less current, but more volts P=VxI

Eddie current - breaking . A moving conductor in a field will make N and S in an orientation that resists the movement - ie opposing is feed in repelling , and opposites are feed out

The breaking force is turned into electrical energy.

Make a battery by moving a conductor in an Magnetic field. The electrons and Protons are pushed in separate directions making a battery at the ends of the wire.

Lenz's Law

This lesson we successfully showed that a moving magnet or varying electromagnet creates a current in a solenoid that drags against the magnet.

The pages in the syllabus is link, Lenz's law is this link

Summarize this topic by working through HSC online.

Simulations on motors and generator

Homework

Do all questions up to number 23 Page 127 -128.
Hand in 2004 Exam questions.

Today Galvinometer, Loud speakers, Transformer effect - Magnetic Flux.

Also JA, HY, SZ to do Moodle.

homework

Today Motors - Commutator switches the field in the central coil so the north is pushed by the north Homework upto no 15 on page 127 Tomorrows Prac Parrallel Current and Current meters Next Friday Bring in your own motor

Homework Review

Correcting your work show you need to become familiar with the above.

Also:

Increase the orbit by 4, period by 8, orbit by 9, period by 27, orbit by 16 period by 64
Remember for an object, T is on the other side of the line to r, T are squared.
Centripetal is an adjective that describes a gravity, or external force that creates acceleration to the centre of a circle
Aether predicted MM show c depends on frame, MM negative, Impact in Scientific Method means Aether has to be abandoned.
Special Rel was developed as a thought experiment, generating hypotheses. Proven by K mesons life time being extended. Atomic Clocks in space craft, electrons increasing mass in TVs. Properties of Elements derived from Quantum Mechanics – Spectra and the fact that Hg is liquid.

hsc homework

Get your own - Open publication

Homework 9 Feb

JA JK JS GW SZ to Handin
Pracs to be handed in
Unit 11 Electric Motors - 11.2 and 11.3

latest worksheets corrected

work sheet

The first theta is angle of current to field line, The second theta is the angle out of flat with the electric field.

Students have correctly worked out the need for a rotation switch or commutator for a DC motor.

homework

Finish worksheet 2 and hand in to staffroom by 2 pm Tuesday

JH-GW-PW to catchup with questions 7 - 11