2 - Basic Laws, Conductance, and Mosfets

INTRO: Today in class we covered the basic Laws (Ohms, and the two Kirchoff Laws). We also covered the topic of Conductance as well as aa MOSFET type of transistor.

Here we started off with our usual circuit quiz. Professor Mason made a diagram and we predictions as to what would happened. Using some basic circuit knowledge, we made a prediction, an incorrect one though.

Here we first started working with OHM's Law and a graph of voltage vs. current. Outside of one exception, the other has to be zero if the other one is. We also derived new expressions for power of a resistor using the concept of Conductance. Conductance is the reciprocal of resistance.

Here we used Ohms Law  (V=IR) and our new passive sign convention, which opposes our old 4B convention, to solve a basic circuit problem

LAB: Resistors and Ohms Law

Here we experimented with a basic circuit and a variable voltage source to get real world readings on current within the circuit. We used an Analog Discovery tool, which can provide us with up to +/-5v, and WaveForm software to vary to voltage within that 5v. We also used the multimeter, to measure the current in Ma. The real world voltage were very close to what the calculated amount should be, as the table above shows.

Above is the graph of the data, as well as the correlation coefficient and the equation of the best fit line in the top lift corner: y = 0.0091x - 6.5 X 10^-5

Here we worked with the concepts of Branches, Loops, and Nodes. A branch is an element, a loop is a loop that can be made without another within, and a node is a point between branches.

LAB: DEPENDENT SOURCES AND MOSFETS

Here we used a Mosfet transistor, which needs to be stimulated with minimum voltage to allow current to flow through it. We used variable v oltages to find our threshold voltage to be 1.5V. The Mosfet can be classified as a VCCS/Voltage controlled current source.

Here is the plot of the data, as expected it has a linear portion and ends and begins with an increasing and decreasing slope.

1 - Short and Open Circuit, Breadboards

INTRO: Today we used breadboards, which are boards where  certain rows or columns are connected, to demonstrate two different types of circuits.





Above is a picture of a breadboard. Certain rows and columns are connected, while others aren't, which makes it ideal when trying different circuit diagrams.


LAB: Solderless Breadboards, Open-circuits, and Short Circuits.

Here we used a multimeter, jumper wires, and a breadboard to measure resistance. It was a short so we measured 4.6 mOhms. For practical purposes, this can be considered practically 0. This makes sense as a short circuit has a resistence approaching 0.



For the next situation, the recording was above what we could measure. This happens because the points that the end of the multimeter were connected to were not connected at all. This causes a resistance approaching infinity. This case can be compared to holding the two ends of the multimeter up, separated above air.

Above are the results of the 4 situations attempted. A & D are open circuits, while B & C are short circuits

To summarize, the progression of circuits by increasing resistance you have short, closed, and open.