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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
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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