Engineering44djGarcia

Practical Voltage and Current Measurement Prelab Lab     Lab Resistors Voltages Name MΩ Name V R1 2.2 Vs 4.99 R2 2.27 V out 2.28 Results              Non-Ideal Meter Rq(MΩ) Rm(MΩ) 1.85 10.03 Using this derived formula we can see that a 10.03 megaOhm resistor in parallel is the going to act as the resistance of the meter. 

Dusk Till Dawn Objective Measurements Conclusion Objective         The objective of this lab is to use a transistor and a photocell to control an LED. In essence, we are making a night light.       Measurements Photoresistor Voltages Resistor(kΩ) Theory (V) Measured (V) % Difference 5.00 1.68 1.81 -6.99 20.00 3.35 1.94 72.68 7.00 2.08 1.94 7.07             Conclusion        There was a sizable discrepancy between the measured and calculated voltages at the 20k resistance. I am thinking this is probably because the resistor doesn't get anywhere to close to 20k. In fact, I added a projection for when the resistor is closer to 7k and the difference falls closer to 7%, similar to the 5k assumption from the first trial. I assume this tells that the photocell acutally has a much more narrow range of values than assumed.