Quiz 1

We use KCL and KVL to write a system of equations that allowed us to find the V1 as a function of I₁, I₂, R₁, R₂ and R₃.

FreeMAT

Assignment 1

ADDING SINUSOIDS

Functions to convert form rectangular to polar

Assignment

1-3

Lab 2-2: Resistors and Ohms Law

Resistors and Ohms Law

1. The measured resistance of resistor is 98.2. 

 2.Circuit and data are shown above. 

3.The equation for best-fit line is y=9.127x+0.387.correlation coefficient is r=0.998

Lab 2-1: Dependent Sources and MOSFETS

Dependent Sources and MOSFETS

 1.We measured resistance of resistor R=100.3

2.  We use WaveForm as power supply  through the resistor. We measured the current across the resistor. From the data table the threshold voltage is approximately 1.5V.     Because current appears when voltage goes above 1.5V. 

 3. The graph of V vs. I. It is a linear relationship,because V=IR. 

4.The transistor is behaving like a voltage dependent current source because the transistor control the current go through the circuit based on the voltage on the gate.1

5. The estimated value is 4.297. The linear part of the plot and find the slope of best fit line of the graph.The slope obtained by Excel is 4.297 which is the g for circuit.

Summary: We learnd about voltage controlled current source (VCCS) of the depend source, 

Lab 6: Mesh Analysis III

Mesh Analysis III

This is the value we get for V1. V1=2.45V (Theoretical value: 2.64 V)

This is the value we get for i1. i1=-0.253 mA (Theoretical value: -0.26 mA)

measurement datas:

This is the set up of the experience:

The summary table of the real value of the resistors and the theoretical value and the experimental value of the voltage and current. We get 2.69 % difference in our i1 value, and 7.19% difference on our V1 value. 

Lab 5: Nodal analysis

Pre-lab: 

Using nodal analysis to predict the circuit behaviour.

 measured value of v1 is 2.38v. 

 measured value of v2 is 4.37v. 

Measurement datas:

We got the voltages measured accros 22Kohm and 6.8 kohm. V1=4.4241v, V2=2.4241v. 

This is the voltage across the resistor when there’s not light. Our experimental value is 4.38 V, while our theoretical value is 4.42 V. 

% difference: (4.38-4.42)/4.38*100%=-0.9%

Lab 4: Temperature Measurement System

Temperature Measurement System

Pre-Lab: The range of resistor is (4366.7, 17653), so we choose 10k resistor.

This is the set up of the experience.

Voltage reading at room temperature 20.

Voltage reading temperature for heat from the body 37C.

Voltage reading at room temperature20C and heat from the body temperature 37C.

Resistor reading at room temperature20C and heat from the body temperature 37C.

Here is a video about our experiment.

 The datas from Measuring.

We have a difference in voltage of 0.62 V, and the theoretical value of voltage drop should be 0.72 V, so it has a % difference of 13.8%. 

Post Lab: We are then asked to design a new circuit that the output sensitivity of the device must be at least 0.1 V/degree. After our calculation, we find that it is impossible to get it. The maximumVoltage is 0.727 V at resistor  8579 ohm. Twhen the  resistor  at 8200ohm the design is most sensitive. 

Lab 1:Solderless Breadboards, Open-Circuits and Short-circuits LAB

Solderless Breadboards, Open-Circuits and Short-circuits LAB

1,  Using DMM as an ohmmeter we measured resistance between two holes in the same row, we measured           0.4 Ohm and it was short circuit.

2,  Using DMM as an ohmmeter we measured resistance between two rows of holes on opposite sides of the breadboard, we get infinite Ohm and it was open circuit.

3,  Using DMM as an ohmmeter we measured resistancebetween two arbitrary holes in the different row on the breadboard., we get infinite Ohm and it was open circuit.

4,  Using DMM as an ohmmeter we measured resistance  between two different rows on the breadboard with a jumper wire connect the two nodes, we get 0.5 Ohm and it was short circuit.

Summary: By using a DMM, we  know how to measure a circuit is short-circuit or open-circuit and basic property of breadboard.

Lab 3: Dust to Down light

Dust to Down light

Pre-lab : We are asked to calculate the actual voltage across the photocell. When it is dark, it has a resistance of 20k, and has a voltage of 3.33v.  When it is light, it has a resistance of 5k, and has a voltage of 1.67v.

This is the set up of the experience. At room light, it does not light up.

.

2. This is the voltage across the resistor when there’s light. Our experimental value is 0.67 V, while our theoretical value is 1.67 V. 

% difference: (1.67-0.67)/1.67*100%=-59.88%

This is the voltage across the resistor when there’s not light. Our experimental value is 2.74 V, while our theoretical value is 3.33 V. 

% difference: (3.33-2.74)/3.33*100%=-17.78%

The % difference is too big, because the actual resister for LED is 3.5K and 27.5K when light and on light.

Here is a video about our experiment.