Sunday, November 14, 2004

Lesson 11

ELECTRICITY LESSON 11 – Electric Potential (Voltage)
Lesson: 11.
Homework take up electric circuit pg. 66, 67
Take up Quiz
Text pg. 302, 303
Overhead Electric Potential voltage
Board note of electrical potential
Shared Reading – Electrical potential pg. 302.303.
Homework: Questions 1,2,3,5 pg. 303.


Electric circuit
If you take a continuous source of electricity, such as a battery, and connect conducting wires from the positive and negative poles of the battery to an electrical device such as a light bulb, you have formed an electric circuit.
Figure 1 - Electricity goes around in a circuit
In other words, the electricity flows in a loop from one end of the battery (or source of electricity) to the other end in a circuit. The concept of electric circuits is the basis for our use of electricity.
Take a battery for example. When the electrons build up on one side (negative end) and the protons build up on the other (positive end). You get a lot of potential energy. The electrons want to leave. The way to get them to leave is to connect the negative end to a good conductor and complete the circuit by connecting the conductor to the positive end of the battery. The attraction is very strong by the protons which causes the electrons to flow out of the battery, along the wire and then back to the battery.
As the electrons get “used up” and the protons become combined with the electrons at the “positive end” you get less electric potential or voltage. That’s when your stereo starts to fade and the voices get slow and the music doesn’t play as loud. Not enough electrons!!!




Here is a great site on Voltage:
http://www.ndt-ed.org/EducationResources/HighSchool/Electricity/voltage.htm

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