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Physics 200 2015-2016 Chapter 20-21 – Current, Resistance, Ohm’s Law and Circuits Class # Date 27 03-10-16 B 28 03-11-16 A 29 03-14-16 B 30 03-15-16 A 31 03-16-16 B 32 03-17-16 A Topics & Activities 20.1. Current • Define electric current, ampere, and drift velocity • Describe the direction of charge flow in conventional current. • Use drift velocity to calculate current and vice versa. 20.2. Ohm’s Law: Resistance and Simple Circuits • Explain the origin of Ohm’s law. • Calculate voltages, currents, or resistances with Ohm’s law. • Explain what an ohmic material is. • Describe a simple circuit. Lab – Series and Parallel Light Bulbs 20.3. Resistance and Resistivity • Explain the concept of resistivity. • Use resistivity to calculate the resistance of specified configurations of material. • Use the thermal coefficient of resistivity to calculate the change of resistance with temperature. 20.4. Electric Power and Energy • Calculate the power dissipated by a resistor and power supplied by a power supply. • Calculate the cost of electricity under various circumstances. 21.1. Resistors in Series and Parallel • Draw a circuit with resistors in parallel and in series. • Calculate the voltage drop of a current across a resistor using Ohm’s law. • Contrast the way total resistance is calculated for resistors in series and in parallel. • Explain why total resistance of a parallel circuit is less than the smallest resistance of any of the resistors in that circuit. Assignment Due • Calculate total resistance of a circuit that contains a mixture of resistors connected in series and in parallel. Circuit Practice Series and Parallel Circuit Basics - PhET 33 34 35 36 37 38 39 40 41 42 03-18-16 B 03-21-16 A 03-22-16 B 03-23-16 A 03-24-16 B 03-25-16 A 03-28-16 B 03-29-16 A 03-30-16 B 03-31-16 A 04-01-16 B 04-04-16 A Where Does Our Power Come From Activity? SBAC Testing Juniors / A34 & A12 Energy Use At Your Apartment SBAC Testing Juniors / A56 & A78 Energy Use At Your Apartment (cont’d) Energy Use At Your Apartment (cont’d) Energy Use At Your Apartment (cont’d) SBAC Testing Juniors / B34 & B12 Energy Use At Your Apartment (cont’d) SBAC Testing Juniors / B56 & B78 Energy Use At Your Apartment (cont’d) 21.4. DC Voltmeters and Ammeters • Explain why a voltmeter must be connected in parallel with the circuit. • Draw a diagram showing an ammeter correctly connected in a circuit. • Explain why measuring the voltage or current in a circuit can never be exact. Chapter 21 Equivalent Resistance Challenge Nova Video – Saved By The Sun Chapter 20-21 Concept Test (Practice) Chapter 20-21 Review Chapter 20-21 Test