12.6.2 12.6 For three resistors in Relating circuit to Might help: A slope model for parallel: pd across each circuit diagram pd. Allow three ball-bearings to resistor is the same as the roll simultaneously down from Measurements pd across the combination the lip of a wide plastic funnel could be confusing (held over a bowl). Each has its Current though undivided to follow own route but the drop distance part of circuit = sum of Derivation of is the same each time. currents through each resistance that resistor help: Current model of follows activity group splitting up to go along could be three routes then rejoining challenging; idea of again. Reduced resistance reduced total effect like using three delivery resistance is at first vans at the same time rather counter-intuitive than one 12.7 - Some energy is Might help: Rope model dissipated as heat when a current through a conductor Power P = VI Energy H = V I t Energy H = I2 R 12.7.1 - Practical applications of Will all students be – heating effect: heaters, familiar with all of toasters, etc., filament these examples? lamps, fuses Section Activity Key teaching Sources of What models or analogies points/what do I want difficulty? are used or might help students to learn from here? activity and related text?
12.6.2 12.6 For three resistors in parallel: pd across each resistor is the same as the pd across the combination Current though undivided part of circuit = sum of currents through each resistor Relating circuit to circuit diagram Measurements could be confusing to follow Derivation of resistance that follows activity could be challenging; idea of reduced total resistance is at first counter-intuitive Might help: A slope model for pd. Allow three ball-bearings to roll simultaneously down from the lip of a wide plastic funnel (held over a bowl). Each has its own route but the drop distance is the same each time. help: Current model of group splitting up to go along three routes then rejoining again. Reduced resistance effect like using three delivery vans at the same time rather than one 12.7 - Some energy is dissipated as heat when a current through a conductor Power P = VI Energy H = V I t Energy H = I2 R Might help: Rope model 12.7.1 - Practical applications of heating effect: heaters, toasters, etc., filament lamps, fuses Will all students be familiar with all of these examples? – Section Activity Key teaching points/what do I want students to learn from activity and related text? Sources of difficulty? What models or analogies are used or might help here?
SS10_AIE_Final.docx