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7Px XIG 06 Here-Turi-Kōkā 2015 What we will do What we will learn See the difference between the real world and the perfect one Why a wire does not melt.

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Presentation on theme: "7Px XIG 06 Here-Turi-Kōkā 2015 What we will do What we will learn See the difference between the real world and the perfect one Why a wire does not melt."— Presentation transcript:

1 7Px XIG 06 Here-Turi-Kōkā 2015 What we will do What we will learn See the difference between the real world and the perfect one Why a wire does not melt when a battery is “shorted” Identify the sneaky resistance As above Use Y11 maths to find the “sneaky” internal resistance That y=mx+c is enough for us to find the hidden resistance See Mr Xi’s “take” on this topic Another way of looking at it See the green book’s “take” (NB: this formula is NOT on the formula sheet in the exam) Another way of looking at it Set new HW and a new due date AND have HRT The way to make the 20 th of Nov is to press forward in small bites

2 No. of marks What for 1 Having sketches and FULL working 1 Neat presentation and down-page format 1 Answer underlined and units given 1 Self marked and all correct – eventually 1 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 Waves: Unit 1 Due Wed 29 th of July 2015 Revision of NCEA2 wave knowledge Waves: Unit 2 Due Mon 3 rd of August 2015 Standing Waves Waves: Units 3 and 4 Due Mon 10 th of August 2015 Standing Waves on strings and pipes PLUS Physics of music Waves: Units 5 and 6 Due Wed 12 th of August 2015 Two source interference Waves: Units 7 and 8 Due Fri 14 th of August 2015 Multi source interference AND Beats (as in musical tuning) Waves: Unit 9 Due Mon 17 th of August 2015 Doppler Effect Waves: Practice Assessment Due Wed 12th of August 2015 Everything in the Waves Standard

4 http://whangareigirlshigh physics.wikispaces.com/ NCEA3+Physics+Core

5 Internal Resistance of a cell A real cell has internal resistance A perfect cell does not have internal resistance Perfect Cell Real Cell ………. Is what the voltage should be or would be if there was no resistance and ………….. Is the voltage that is lost by the internal resistance

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