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Transcript
PHYS-104 - COLLEGE PHYSICS BEHAVIORAL OBJECTIVES - UNIT II (C) (C) = Closed Book or No Equations; (O) = Equation Sheet (C) A. In regard to direct current, to be able to identify: 1. 2. 3. 4. 5. 6. 7. the direction of conventional current and electron flow in a given circuit from a list of possible answers, the physical meaning of current, EMF, voltage, power, and resistance the effect of material, cross-sectional area, and length of wire on resistance the effect of temperature on resistance describe what occurs in a conductor when electric current flows advantages and disadvantages for connecting two batteries in series and parallel as well as apply to a practical situation and interpret a simple circuit diagram and state the potential difference between various points of the circuit for batteries and resistances. (C) B. For a given electrical current, be able to show how a voltmeter and ammeter must be connected properly between two points of the circuit using the proper diagram and identify the type of resistance (and why) each must have. (C) C. Be able to apply Ohm's Law to: 1. 2. (O) D. In regard to charge flow, be able to: 1. 2. 8409633433 solve for resistance, current and/or voltage in terms of the other two variables identify the answer to a practical situation, e.g. does a toaster have a large resistance? solve for the current, charge, and/or time of flow in terms of the other two variables solve for the number of electrons flowing given charge or current. - (O) E. For resistivity problems, be able to solve for: 1. 2. (C) F. the resistance, resistivity, length and/or crosssectional area (diameter) of a wire in terms of the other variables the new resistance, new temperature, initial resistance at initial temperature, or temperature coefficient of resistivity given the other variables. For electrical power, be able to: 1. 2. 3. (O) - 4. solve for power, current and/or voltage in terms of the other two variables explain a practical situation, e.g., does an appliance use up electricity? solve P = I2R problems, for one variable in terms of the other two solve for the energy in joules and kwh for a given voltage, current, and time. LABORATORY OBJECTIVES Creation of An Electric Current A. For the Creation of an Electric Current experiment, be able to: 1. 2. 3. 4. B. For a given wire, be able to identify the effect on resistance and current of the wire's: 1. 2. 3. C. explain the battery's role in producing charges determine whether or not current will flow for a given electric circuit explain why a bulb lights up (glows) more brightly using the particular set-up of two batteries instead of one relate the brightness of a bulb to charge flow. This will be tested in lab. diameter length type of material assuming other variables are not involved. An ammeter will be used to measure current. Apply the basic principles learned in Objectives A and B to explain the results of a practical situation. - - Read: 1. 2. 3. College Physics, 9th ed. by Serway, Chapter 17 thru p. 605 College Physics (Schaum's) pages 297-310 in 11th ed.(pps. 265-277 in 10th ed.) Conceptual Physics, pages 436-451 in 10th edition (pages 438-452 in 9th edition); both on reserve in LRC. Homework: Chapter 17, MC Q’s 9 & 10; Concept Q’s 4, 5, 6, 7, 8 & 11 Problems 1, 13, 20, 22, 28, 33, 34(a), 40*, & 59*, Answers to Selected Even-Numbered Problems for Homework: Multiple Choice Question #9’s correct answer is 2.0 ohms 20. (a) 5 x 105 V 22. 6.32 Ω 28. 1.08 x 10-3/0C 34. (a)$0.29 (b) come to class to discuss Audio-Visual: Simulation websites: Law www.walter-fendt.de/ph14e/index.html Laboratory: Creation of An Electric Current(7) Batteries, Bulbs and Current(8) Resistance in a Circuit(9) Superconductivity Demonstrations Investigating Electric Current(10) Resistor Combinations: Parallel(11) Resistors in Series and Resistors in Ohm’s - - LABORATORY OBJECTIVES Creation of An Electric Current A. For the Creation of an Electric Current experiment, be able to: 1. 2. 3. 4. B. For a given wire, be able to identify the effect on resistance and current of the wire's: 1. 2. 3. C. A. explain the battery's role in producing charges determine whether or not current will flow for a given electric circuit explain why a bulb lights up (glows) more brightly using the particular set-up of two batteries instead of one relate the brightness of a bulb to charge flow. This will be tested in lab. diameter length type of material assuming other variables are not involved. An ammeter will be used to measure current. Apply the basic principles learned in Objectives A and B to explain the results of a practical situation. Resistance in a Circuit For a simple circuit to be used for finding the currentvoltage relationship of a resistor (to include a light bulb), be able to: 1. 2. 3. 4. 5. properly connect the circuit construct and interpret the current-voltage graph identify the voltage and current characteristics for two batteries in series and in parallel plus apply the results to discuss practical situations. plot a voltage vs. current graph to find the resistance and power input of a light bulb and interpret physically hook up two dry cells in series and in parallel. B. For an unknown color-coded resistor be able to read its resistance and tolerance from memory. C. For a given unknown resistance, be able to calculate its resistance within 15% accuracy using any experimental method you choose, which you will clearly outline, showing all calculations.