Lab Report Day One - Solderless Breadboards, Open-Circuits and Short-circuits

In today's lab, we are going to use Digital Multimeters (DMMs) to measure the resistance between the holes. Those holes could be in either same node, or in different node but in same row, or in different row, or finally connect two nodes in different rows and measure the resistance between them. We are told that when the resistance is close to 0, it is short-circuit.When the resistance is close to ∞, it is open-circuit.


1. First, we use DMM to measure the resistance between two holes in the same node on the breadboard. Just as the instruction said, we had a very low resistance between the holes. We get 4.6Ω.
Based on what we learn, it is short-circuit.




2. Then, we use DMM to measure the resistance between two holes in the same row but in different node on the breadboard. Just as the instruction said, we had a very high or infinite resistance between the holes. We get ∞ Ω. The measurement goes all the way from 1 M to 19 M and finally goes to 1, which is too large to measure. We consider this infinite. 
Based on what we learn, it is open-circuit.




3. Then, we use DMM to measure the resistance between two arbitrary holes in the different row on the breadboard. Just as the instruction said, we had a very high or infinite resistance between the holes. We get ∞ Ω. The measurement goes all the way from 1 M to 19 M and finally goes to 1, which is too large to measure. We consider this infinite. 
Based on what we learn, it is open-circuit.




4. Finally, we use DMM to measure the resistance between two different rows on the breadboard with a jumper wire connect the two nodes. Just as the instruction said, we had a very low resistance between the holes. We get 4.6Ω.
Based on what we learn, it is short-circuit.


How we connect the DMM to the breadboard.
The resistance we get.


5. Result for lab


Here is the result we get from the four experiment. (The (A) part from the previous pictures should be 4.6 since we misread it.)

We can conclude that in a breadboard, it is short-circuit in the same node or when the two nodes are connected together with a jumper wire. It is open-circuit in different nodes, no matter they are in same rows or different rows.

Summary:

Today, we review some knowledge we previously learned from PHYSICS 4B. We  know how to measure a circuit is short-circuit or open-circuit. We also learn some basic property of breadboard.