1. 7Px XIG 16 Whiringa-ā-Nuku 2015
What we will do
What we will learn
Preliminaries and Roll
How to start well
Look at current through and voltage across a capacitor in DC when the switch is closed
The lack of simultaneity
Which happens first
Extend this idea to AC and sketch graphs of I and V for a capacitor in an AC circuit
How the current through and voltage across a capacitor are related
Do the preliminary question for AC unit 3
How to tackle test-type questions
Set a due date for AC Unit 3 and have some HRT on it
How to tackle exam-type questions

2. 7 Physics Homework Marking
No. of marks
What for 1
Having sketches and FULL working
Neat presentation and down-page format
Answer underlined and units given
Self marked and all correct – eventually
In on time and signed for (“This is my own work”…….)
Total
A mark out of five that will contribute to the “homework” grade in the reports

3. HW item Skills practiced Capacitors in DC: Unit 4
Due Monday 21st of Sept
Networks of capacitors
Capacitors in DC: Unit 3
Due Tuesday 22nd of Sept
Energy stored on capacitors
Inductors in DC: Units 1, 2 and 3
Due Tuesday 13th of October
NCEA2 revision, Flux, Faraday’s Law and Lenz’s Law
Inductors in DC: Unit 4
Due Thursday 15th of October
Transformers
AC: Units 1 and 2
Due Wednesday 21st of October
RMS and
Reactance in Capacitors
AC: Unit 3
Due Friday 23rd of October
Reactance in Inductors
AC: Unit 4
Due Tuesday 27th of October
Phase difference in a capacitor-resistor (CR) circuit

5. Unlike a DC circuit, where the light does not glow because the capacitor stops DC current, the light in an AC circuit glows all the time because…
The current is constantly changing direction and flowing through the lamp as it charges the capacitor up, first from one side and then from another