Friday, January 13, 2017

Friday January 13, 2017  Daniel Bruce and Moaad Alzahrani

Week 1 

 1. What is the class format?

Monday- Quiz discussions, lab intro, lab, and wrap-up

Wednesday- Lab and wrap up

Friday- Blog commenting and blog discussions

Non Class day- work on quizzes and work on any unfinished blog or lab work

Quizzes(15 total)- 45% of grade
Blog reports(15 total)- 30% of grade
Midterms(2 total)- 10% of grade
Final exam(1 total)- 15% of grade

2. What are the important safety rules?

There are many safety rules, but we view these as the most important safety rules.
  • Do not work alone on energized electrical equipment
  • Never touch electrical equipment with wet hands or touching water
  • Never handle ungrounded equipment
  • Switch power off whenever assembling or disassembling a project
  • Ask the instructor to check out your circuit if you are unsure before applying power
3. Does Current kill? Explain.

Current does kill! It is very dangerous and can be likely to kill in the range of 100-200 mA. Even less can affect breathing and shock you. Although higher current is dangerous as well, it can cause severe burning and stop your breathing. With wet hands the resistance of a person may be as low as 500 ohms and only 5 volts would deliver 10 mA of current, which is enough to borderline dangerous and cause painful shock.

4. How do you read color codes? (Video)

Here is a quick video pointing out the color bands and how they correspond to the resistance value.

5.What is the tolerance? Give an Example from your experiment.

Tolerance is the acceptable range of values a resistor may have, it is a percentage value + or - .
An example from my experiment was a resistor rated for 150 ohms +/- 5% (brown, green, brown, gold). The actual reading from the multimeter was 149.2 ohms.

6. Prove all of your resistors are in tolerable ranges (Table and explanations).

Here is a table listing the resistor values according to their band color on the right column. The left column includes the band colors read from left to right, and the actual resistance measured by the multimeter. All the resistance values look to be in the correct specification. Except for #9 had a resistance rated for 20.1 ohms and measured 201.8 ohms. Although the resistor has no tolerance (5th band white) I suspect there was an error in measuring the resistance.

7. What is the difference between measuring the voltage and current using a DMM? Why?
When you want to measure the voltage, the circuit should be with the multimeter in parallel in order to get the right measurement. When you want to get the measurement for the current, you will have to connect the circuit with two wires to connect them to the multimeter. 

8. How many different voltage values can you get from the power supply? Can each one of them be changed to any value?

There are 3 different ports that receive power. The one on the left is fixed to 5 volts, and cannot be changed. The other 2 power supply ports can be adjusted infinitely between about 1 volt up to about 25 volts. The adjustment is made by rotating the voltage knob corresponding to the power supply port.

9. Practice circuit results (video) & (photo)

Here is a quick video showing the measurements we obtained with the multimeter

Here are the photos of the various measurements we made with the multimeter.We measured resistance, voltage and current.

10. How do you experimentally prove Ohm’s Law? Provide measurement results. Compare calculated and measured voltage, current, and resistance values. (Table and Experimental setup photo)

After finding the data that we need, we can apply Ohm's Law. V=IR for the voltage, I=V/R for the current, and R=V/I for the resister. when we apply the law by the all three ways we will still get the same numbers. 

11. Rube Goldberg circuit (video).

Here is a quick video showing our set up for the Rube Goldberg circuit.

12. Draw the circuit diagram for the Rube Goldberg set-up.

Here is the circuit diagram for the Rube Goldberg set-up we constructed. The legend on the right labels the letters in the diagram on the left.

13. How can you implement this setup into a Rube Goldberg machine? Drawing required.

First, the light will turn on the motor. After that, when the motor is on and starts moving the motion sensor will get that and gives the order to move the pin to his the balloon. 


  1. It was important to note the various effects of current besides death, so it was good that you touched on this, but you could expand on it more. All in all, what you have so far looks good.
    ~Group 4

  2. Make sure to clean up some of the format for your answers, you can do this by using white space, and special characters. it's flow just seems unnatural, making it difficult to understand what is being said. But your blog post isn't totally set-up at the moment, we look forward to seeing what it looks like when complete.

  3. I liked several photos approach. Good start. Talk in your videos.
    - Captions missing
    - Circuit diagram could be better.