Monday, November 15, 2004

Lesson 15 - Announcement

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Here is the latest lesson:
ELECTRICITY LESSON 15 – Cells in Series and Parallel
Lesson: 15.
Take up Hwk: Discussion Questions text 311 #1-3
Hand back quiz
Lesson: Let’s get ready for OHM’s
Handout: Electrical Resistance and Ohm’s Law
Series Circuit and Parallel Circuit overhead
Lab investigation: build a simple series circuit and a simple parallel circuit
Homework: review concepts and make notes of the overhead IN YOUR OWN WORDS!
There will be a NOTEBOOK CHECK THIS WEEK!!! The following website has a copy of the rubric that will be used to assess your notebook: http://teachers.teach-nology.com/cgi-bin/notebook.cgi

Overhead Note Series and Parallel Circuits:
RECALL:
Amperage is a term used to describe the number of electrons moving past a fixed point in a conductor in one second.
Current is measured in units called amperes or amps
An ammeter is this instrument and it is used to indicate how many amps of current are flowing in an electrical circuit.

EMF is electromotive force. or VOLTAGE causes the electrons to move in a particular direction.
EMF is measured in units called volts.
A Voltmeter is this instrument and it is used to indicate how many volts of current are flowing in an electrical circuit.



Another way of saying this is: without EMF, there will be no current. Also, we could say that the free electrons of the atoms move in random directions unless they are pushed or pulled in one direction by an outside force, which we call electromotive force, or EMF.


SERIES / PARALLEL CIRCUITS

A series circuit is when there is only one path for the electrons to take between any two points in the circuit. In other words, the components, which are the battery, the switch, the ammeter, and light, are all in “series” with each other.


Like the series circuit, parallel circuits also contain a voltage (current) source as well as wires and other components. The main difference between a series circuit and a parallel circuit is in the way the components are connected. In a parallel circuit the electricity has several paths that it can travel


Build your own circuit using the net at:
http://www.ndt-ed.org/EducationResources/HighSchool/Electricity/seriesparallelcircuits.htm

Check the sidebar to build both series, parallel, and series/parallel circuits!

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