Quiz/temp measurement lab

We took group quiz and following wAs our answer . we use KCL and KVL to write a system of equations that allowed us to find the voltage across R1 as a function of I₁, I₂, R₁, R₂ and R₃.

 

Temperature Measurement system lab:  We created an electrical circuit which uses this resistance change to output a voltage which indicates the temperature of the thermistor. The system will use a thermistor to detect temperature changes. A thermistor is a device whose electrical resistance changes as a function of the temperature of the thermistor.

that the relationship between temperature and resistance is not linear

Our design criteria are as follows: Design a circuit like that shown, containing a thermistor as one of the resistances, which satisfies the following specifications:

1.      +5V input voltage to the system

2.      Output voltage varies by a minimum of 0.5V over a temperature range of 25^°C to 37^°C.

3.      Output voltage must increase as temperature increases

Following table of measured and calculated values with % error differance.

Following is a video of 12K ohm Resister used and voltage increase was .50 V. 

we used almost 4 other resisters. you can see our % error calculated above on white board. 

Uncertainity: we could have used better source of equipment for accurate results. the resisters didn't measured to be exact values.