D2 - Resistors and Ohms Law, Dependent sources and MOSFETs

We started the class again with another light switch electrical problem, picture below with our tables response.

Picture of our answer to the light switch problem, we were wrong. The correct answer was C which was both the top and bottom bulb stayed the same.

We then moved on to the subject of resistance and Ohm's law. V = IR. G = 1/R. A couple of picture of examples worked out in class, describing power and resistance.

P = VI and also P = I^2R.

White Board work of an example done in class manipulating P = VI and P = I^2R

Resistors are passive elements, incapable of producing energy. We then moved onto our second lab.
Resistors and Ohms Law, Dependent sources and MOSFETs:
We set up the Resistors and Ohms Law lab first. Pictures below. Required of lab picture of schematic, data, and graphs.

Picture of recording resistance of our resistor.

Data of Vs Vr ir with our R = 101.3.

Another picture of our resistor lab.

Picture of data and schematic of Resistor lab.

Post lab work for Resistor lab.We did a poly-fit both linear and quadratic. Our r value was close to one, which means it was solid data, the further from one the less sense a fit makes.

Voltage Vs Current of a resistor, higher voltage more current in the resistor.

We then moved on in class and talked about nodes branches and loops. A branch is something that connects elements together, a wire connected two resistor. A node is connection between branches. A loop is any closed path in a circuit. b = L + N - 1

An example in class to find the b, L and N of the circuit. b = L + N - 1

We then talked about KCL and KVL. Pictures below of an example following current through a circuit.

Finding current and voltage through circuit using KCL and KVL, I = 4A V = 28V

We then moved onto the second lab of the day:
Dependent sources and MOSFETs
The second lab required: pictures of the set up, schematic, data, and graphs.

Picture of our setup of the MOSFET lab. We used the same resistor as the last class with R = 101.3 ohms

A more far away picture of the same setup with a laptop.

Picture of the data and schematic required of lab. We note the Voltage threshold.

Data and plot of MOSFET Lab, r value is not close to one so the liner fit is not the best, however this makes sense sense the MOSFET does not act linear like the resistor. The slope is the G value the 1/r of a resistor. So resistor is 101.3, G = 1/101.3 = 0.009 or G = I/V = 2.5E-3/2.5 = 0.01

The transistor acts like VCCS - Voltage Controlled Current Source. It needs a certain amount of voltage to "turn on" like a transistor, or diode. (0.7V) The gap between P-N or N-P.

Data and plot of MOSFET Lab, r value is not close to one so the liner fit is not the best, however this makes sense sense the MOSFET does not act linear like the resistor. The slope is the G value the 1/r of a resistor. So resistor is 101.3, G = 1/101.3 = 0.009 or G = I/V = 2.5E-3/2.5 = 0.01 (Edit ver 2)

In summary:
We learned about resistance and Ohm's Law. V = IR, G = I/V or 1/R. What branches, nodes and loops are, b = L+N-1. Learned about KCL and KVL to diagnosed a circuit. How resistors act linearly with voltage and current. How MOSFETS don't act linearly and have a threshold voltage like transistors and have a cap after a set amount of voltage. Used Matlab to find and plot relevant data.