(1)
The class is three days a week Monday, Wednesday, and Friday. On Monday we will discuss last weeks quiz, then we will introduce the lab and begin to work on the lab. Out of class between Monday and Wednesday we are to respond to the comments on our blogs from the previous week. On Wednesday we will continue to work on the lab and finish it up. For both Monday and Wednesday the last 5 minutes of class are reserved to clean up our work station. On Friday we comment on other groups blogs then discuss on the blogs and the experiments. During the weekend we are to finish the blog for the week then comment on 2 other groups blog and finish the take home quiz.
(2)
Do not work alone, turn off power when assembling or changing circuit, use well insulated probes when taking measurements, stay away from water or other conductors while working with equipment, don't try to catch falling equipment, don't touch two pieces of equipment at the same time, and don't touch circuit while power is on may be hot.
(3)
Current does kill it only takes a current of only at 10 mA to kill a human being and with wet hands a persons skin at the lowest only has 500 ohms of resistance with wet hands and at the highest 100 K ohms. So the lowest voltage that could kill a person is 5 V.
(4)
(5)
Tolerance is the amount of variation of a specified quantity, for example, in the experiment, the resistor was calculated by using colorcoded bands method, the resistor had a tolerance of 5%(gold color) and it was 2.2Kilo Ohms but when the multimeter was used to measure it, the answer was 2.18 Kilo Ohms
(6)
Resistor

Color
code bands (W)

Multimeter
results (W)

Tolerance

Tolerance
Range

1

390

387

+/
5%

370.5409.5

2

270

268.5

+/
5%

256.5283.5

3

2,200

2,180

+/
5%

20902310

4

20.2

2.01

No
Tolerance

__________

5

651

677

No
Tolerance

__________

6

180

184.6

+/
5%

171189

7

150

145

+/
5%

142.5157.5

8

1,500

1445

+/
5%

14251575

9

3.71

3.9

No
Tolerance

__________

10

27.2

27.2

No
Tolerance

__________

These results prove that the difference between the result using colorcode bands and the actual result is within the tolerance range. However, there are some results weren't accurate and i believe that there was something went wrong or that the colors were so hard to read.
(7)
To measure voltage by the multimeter should be in parallel with the circuit and to measure current, you should break the loop which means to remove one side of the wire and then connect the black multimeter lead to it and the red multimeter lead to the resistor because the multimeter should be in series when measuring current.
(8)
There are three different voltages values through three different channels. one is fixed at 5 volts and current of 4 Amperes so it cannot be changed. The other two channels A and B are variables which can supply different values of Voltage and can be changed to any value from 024V and current up to 0.5A..
(9)
(10)
First,We applied ohms law to our circuit by using the values we have we found the current. Furthermore, the resistor in the circuit was 82 ohms and the voltage applied was 5 volts, By inserting thee values in the equation V= IR ==> I=V/R we got a current value of 60.9 mA. Then, to prove the ohms law, we used the power supply to apply 5 Volts ,through the fixed channel, to a circuit that has 82 ohms resistor and the result was 57.5. The two results were very close which proves ohms law.
After that we used two resistors and apply 5 different voltage values to the two resistors ,3 times for 82 resistor and 2 times for 47 resistor through the A/B channels, to prove ohm's Law experimentally. However, We think that the measured current in some of the trials wasn't accurate because there was a problem in our power supply. In addition, the other three tests were close to ohm's law value which proves ohm's law.
Resistor Value
(Î©)

Voltage Value
(V)

Ohm's Law current
(mA)

Measured Current
(mA)

82

5

60.9

57.5

82

3

36.6

35.2

82

6

73.1

43.7

47

8

170.2

44.1

47

5

106.4

96.2

(12)
(13)
You can use this Rube Goldberg machine to start off a bigger Rube Goldberg machine by using the motor to start knocking over dominos that are connected to the motor by a string.
Easy to read blog this week. It would help to label what week it is (ex: week 1). If you post a video for #4 and finish #12 and #13, should be good.
ReplyDeleteNice blog. The colors you guys chose make things easier on the eyes. once you finish the remaining questions it should good.
ReplyDeleteGood job. due to the colors you used it is very easy to read. Also this weeks post looks very well done.
ReplyDeleteGood start. Nice videos. Good circuit drawing.
ReplyDelete Captions missing.
 Tables are not nicely formatted. Hard to see them.