Sunday, November 07, 2004

Electricity - Lesson 3 and 4

ELECTRICITY LESSON 3 – The kinds of Electric Charges Lab
Lesson: 3.
Take up Hwk: Text pg. 275 #1-3
Lab – kinds of electric charges c.p. pg. 54-55
Hwk: Hand in lab completed by Friday, Oct. 29
hand out rubric


Assessment Rubric 3: Inquiry Investigation

CRITERIA
LEVEL 1
LEVEL 2
LEVEL 3
LEVEL 4

Initiating
· Asks few questions about the task
· Asks simple questions that may clarify the task
· Asks questions that clarify the task
· Approaches the task independently


· Demonstrates limited understanding of concept(s) related to the task
· Demonstrates some understanding of concept(s) related to the task
· Demonstrates sufficient understanding of concept(s) related to the task
· Demonstrates a solid understanding of concept(s) related to the task


· Has difficulty generating a hypothesis
· Generates a questionable hypothesis
· Generates a valid hypothesis
· Generates an insightful hypothesis

Performing and Recording
· Follows prescribed procedures with limited competence
· Follows prescribed procedures with moderate competence
· Competently follows prescribed procedures
· Selects and follows appropriate procedures

· Requires constant reminders to follow safety procedures
· Requires some reminders to follow safety procedures
· Follows required safety procedures
· Routinely follows all safety procedures

· Uses tools, equipment, and materials with limited competence
· Uses tools, equipment, and materials with some competence
· Uses tools, equipment, and materials competently
· Uses tools, equipment, and materials with a high degree of competence

· Makes few observations
· Makes observations but they may be insufficient to generate data
· Makes sufficient observations to generate data
· Makes rich observations

· Records little data
· Records data but organization is lacking
· Records relevant data in an organized way
· Records relevant data in an organized and skillful way

Analyzing and Interpreting
· Provides limited analysis of the data
· Provides some analysis of the data
· Provides sufficient analysis of the data
· Provides rich analysis of the data


ELECTRICITY LESSON 4 – Lab – Charging By Contact
Lesson: 4.
Take up Hwk: Lab – Kinds of electric Charges c.p. pg. 54-55
Lesson: Charging by Contact pg. 278 text
Lab: Charging by Contact C.P. 56, 57 (materials, pithball, fur, wool, clear acetate rod, black ebonite rod, pith ball electroscope)
Hwk: Discussion Questions c.p. 57

Note:
Charging by Contact

An electroscope is a device used to detect the presence of charge and it's relative amount. One method of charging the electroscope is by conduction or contact. This means that a charged object must actually touch the electroscope and transfer charge too. If the electroscope returns to normal after being touched by the charged object then it is quite possible that the charged object is so weakly charged that it is not willing to share its excess charge with the electroscope.

When charging something by contact it is important to note the following properties:

The objects must actually touch and transfer some electrons.
The objects become charged alike.
The original charged object becomes less charged because it actually lost some charge. Therefore, there is a limit to how many times it could be used to charge something without being recharged.


The following website is a fantastic resource on learning how charging by contact works!
http://www.sciences.univ-nantes.fr/physique/perso/maussion/statelec/PagesEngl/05Conta.html

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