In our shortened classes today (due to conferences) I checked your Electrical Current Units and Circuit Elements work. We also presented our solutions to Ch 18 P: 1 - 9.
Assignment: We turned in our lab reports today and then turned our attention to charge, current, potential difference, and resistance, all ideas fundamental to circuits. For example, how does the amount of current flowing into the bulb shown above compare to the amount of current flowing out of the bulb? The current indicated in the diagram above is the conventional current. How does conventional current differ from the flow of electrons? How does the potential on the left side of the bulb compare to the potential on the right side, greater than, less than, or the same as? Finally, does voltage flow through the bulb?
Assignment for Monday:
Here are schematic diagrams for your lab reports if you happen to be using a word processor: Here's the lab handout:
So what have we learned?
It looks as though everyone has collected their data, the difference in potential across and the current flowing through each circuit element of interest, which was a light bulb, a resistor, or a light-emitting diode (LED). In order to understand better what is going in these circuits, we need to interpret the I-V graphs for these elements.
Assignment:
We are finding out how the electric current (in Amps, aka "Coulombs/second") depends on the difference in potential across a light bulb, a resistor, and a diode. Figuring out how to hook up a circuit and to use a voltmeter and an ammeter are pretty important parts of this study.
Assignment:
First thing today was a pre-test about basic ideas to account for electric circuits. Second, we discussed what happens when we put an electric field in
Metals are important to understand, because wiring is important in electric circuits. Metals are understood in terms of a metallic bond model that was introduced in the following video: What happens if we put an electric field in a metal? One can see in the simulation linked on the Chapter 18 web page.
Tomorrow we will begin our study of electric circuits by building a few to see how basic components of electric circuits behave. The components we will study are
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Physics IIMr. Swackhamer Archives
May 2019
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