What we will do What we will learn 13Px, Ko te Rāpare, 15 Mahuru 2016 Do Now: Find the DC equivalent and the peak voltage for 240V AC How to make new knowledge stick Examine the current “through” a capacitor to determine the lack of simultaneity. Why V and I do not happen at the same time. Reactance of a capacitor What reactance is, what it is measured in and how to find it. Set new HW, set a due date and have HRT How to make great use of time. Mark the HW that is overdue How to stay on track for the 15th of November (59 days)

HW item Skills practiced Elex: pp140 - 143 of workbook Due Wed 31st of August 2016 Electromagnetic Flux and Faraday’s Law Elex: pp144 - 145 of workbook Due Thurs 16 Sept 2016 Lenz’s law Elex: pp146 - 147 of workbook Current growth in an inductor Elex: pp148 of workbook Due Fri 17 Sept 2016 Inductor Time Constant Elex: pp149 - 151 of workbook Faraday’s Law for Inductors Elex: pp152 - 156 of workbook Due Fri 23 Sept 2016 Transformers AC electricity intro Elex: pp157 of workbook Voltage across and Current “through” a capacitor

Homework Marking No. of marks What for 1 Having sketches & FULL working for all 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

Rāhina Rātū Rāapa Rāpare Rāmere Rāhoroi Rātapu

Reference: Purple book page 157

Reference Circle rotating vectors = Phasors (really!) In AC, the voltage across the capacitor LAGS the current by 90 degrees. OR the current through the capacitor LEADS the voltage across the capacitor by 90 degrees