And asked us what happens to the light bulbs when the switch is turned on. My group answered that the top light bulb would bet brighter and the bottom bulb would remain the same. ThenMason set it up and showed us what actually happens.
Both light bulbs remained the same. In other words, they didn't get brighter or dimmer. The reason for this is that the battery adds 1 V at the top and takes 1 V after the current goes through the first bulb. So the total voltage at the top is 3 V and 2 V after the first light bulb which is a voltage drop of 1 V across the first light bulb. This means that the top light bulb has the same intensity. Then the second light bulb receives a 1 V and uses it. This happens when the switch is on and off.
Then we did two labs:
Resistors and Ohms Laws - Voltage-Current Characteristics
For this lab, we hooked up a 100 ohms resistor to the Analog Discovery, which provided the voltage) and made a closed circuit.
We chose several values for the voltage and measure the current running through it. Below is a chart of our data:
Then we analyzed it with Excel
And got the following graph:
Our line had a perfect fit for our data. From the equation, G, which is equal to 1/R, is equal to 9.0714 1/ miliohms. This means that our R = 0.110 miliohms or 110 ohms.
Dependent Sources and MOSFETs
Below is a diagram of our circuit:
We hooked up a 100 ohm resistor in series with a MOSFET and our voltage source (Analog Discovery). A picture is shown below.
We need to find the threshold voltage. We did this by gradually applying more voltage until the DMM showed current flow. The recorded threshold voltage is :
Then we increased the voltage by increments of about 0.3 V up to 5 V. The data with tabulated values is provided below:
We analyzed our data with Excel and obtain the following curve:
The transistor seems to be behaving like a voltage-controlled current source (VCCS).
The estimated value of g is:
It was determined by
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