Thevenin Equivalents

Obejective: Investigate the Thevenin value of volatage and resistance of the load from two models, the original and one simplified setup. Then we will find the maximum power that will be supplied by the system.

1. We used source transformation to find the Rth:

2. We used nodal analysis to establish the open circuit voltage:

3. We calculated the Vy by using nodal analysis. Then we evaluated the short-circuit current and used it to find the Rth:

4. By using the equivalent circuit we determined: the smallest permissible R(L2) using a voltage divider, the short-circuit current using Ohm's Law, and the open-cicuit voltage by inspection

5. We then setup the circuit

6. Data Collection and Analysis:

Conclusion: The original and simplified circuit have a good result of Thevenin Resistance and voltage with a small percentage of difference from the theoretical value that was calculated.

Transistor Switching

Objective: We will investigate the properties of a transistor by analyzing experimental data from the lab. We will be measuring different resistance, from potential meters to fingers.

Part one:
Lab setup:

Before we use our fingertips:

After using fingertips the led turned on:

Part two:
Lab setup:

Data collected:

Nodal Analysis Lab

Objective: We need to compare the experimental value with the theoretical values of KCL by applying the nodal analysis skill, so that we can get a better understanding of the KCL and how multiple source circuits work.


Pre-lab equations and values:

Lab Setup:

Data Analysis:

Conclusion: The results are all well within a reasonable error range, which proves that KCL law and nodal analysis worked perfectly in our lab.

Introduction to Biasing

Objective:
There are two LED's that require no more than 5V and 2V to turn on respectively, they are both being powered by a 9V battery. The objective is to find the amount of resistance for each LED to get the right amount of power to them so that they are not burnt out by getting too much power. The system is set up in series.

The system setup:

We had calculated the resistance the LED's would have on the system and took that in account when we chose the resistors that we needed to keep the LED's from burning out. We then calculated the amount of volts, power, and amps that would be going to each LED.

We then recorded the data needed from the experiment, using our millimeters.

We proceeded to do the calculations for the lab.

In conclusion, once we did our calculations after the experiment was completed we realized that there was a lot of error because both the LED's were not rated correctly. This also caused our efficiency to be very low.
We determined for the efficiency to be at its highest the input voltage source should be 5V so that we would not need any extra resistance for the 5V LED.

Introduction to DC Circuits Lab

Suppose that you have a piece of electronic equipment and its battery source that must be separated by a considerable distance, For instance, your remote operated vehicle may have a tether that is anywhere from hundreds to thousands of feet in length. We must interconnect the two locations with electrical cabling.

Assumptions:
1. Load is rated to consume 0.144W when supplied 12V.
2. Load will operate properly as long as the voltage across its greater than 11V.
3. Battery voltage will remain constant at 12V (an approximation) and that the battery has a capacity of 0.8 Ahr.

Our problem to determine:
1. The maximum resistance the cable may have for the load to still be able to function.
2. The maximum distance the battery and the load can be separated if we use AWG #30 cable.
3. The distribution efficiency
4. The approximate time before the battery completely discharges.

The actual voltage of the battery was 11.90V

The fully built circuit