ECEN 215 – PRIN OF ELECTRICAL ENGRFall 2018Lab 1: Ohms Law and Kirchoffs LawsECEN 215 – PRIN OF ELECTRICAL ENGRFall 2018 Lab 1: Ohms Law and Kirchoffs Laws Submitted by:Student Name UIN: Section # Group #Date Performed: Sept 10th , 2018I. ObjectiveThe purpose of this lab was to understand Ohms Law and Kirchoffs Law through demonstrationof various circuit combinations.II. Procedure1. Using the Digital Multimeter, we found two resistors that have resistances close to 100  and200 .2. With the equipment properly set up, we constructed the circuit in Figure 1.1d and measuredthe voltage, Vs. 3. V1 and V2 were calculated using the measure values of R1, R2, and Vs.4. We also measured V1 and V2 in our circuit, the calculated the percent difference between thismeasured value and the calculated value we found in the previous step. 5. With a Digital Multimeter, we measured the resistance of a photoresistor in ambient light,bright light, and in darker conditions. 6. On the circuit board from the previous experiment, we replaced R1 with a 10k resistor andR2 with the photoresistor. 7. We recorded the voltage across the photoresistor in ambient light, bright light, and in darkerconditions while in the circuit. 8. With a Digital Multimeter, we measured the resistance of a thermistor in room temperatureand when rubbed between our palms to make it warmer. 9. On the circuit board from the first experiment, we replaced R1 with a 10k resistor and R2with the thermistor. 10. We recorded the voltage across the thermistor in room temperature and when rubbed betweenour palms to make it warmer while in the circuit. III. Difficulties1. Most of the resistors provided had been mistreated, so it was difficult to find a resistor in goodshape that was also the required resistance.IV. Results1.3- We found the measurements of R1 and R2 to be 139  and 247  respectively. - The voltage of the circuit, Vs was found to be 4.99V. - Using the reassured values of R1, R2, and Vs we calculated V1 and V2:-4.99 +139 I +247 I = 0I = 4.99/386I = 0.01294 AV1= 0.01294 - 139 V1 = 1.789 VV2 = 0.01294 - 247V2 = 3.196 V- The measured values of V1 and V2 were found to be 1.53 V and 3.42 V respectively. - The percent difference of the measured value and the calculated value was: (1.78 - 1.53) / (1.53) - 100 = 16.3 (3.196 – 3.42) / (3.42) - 100 = 6.551.4.1- The measured resistance of the photoresistor under different conditions was found to be:Table 1: Resistance of the PhotoresistorLight Level Resistance (k)Covered with Cardstock (Dark) 5.7 kAmbient Light (Neutral) 2.8 kFlashlight (High) 1.2 kFrom these results, we can conclude that as the light level is increased, the resistance decreases. As the light level is decreased, the resistance increases. They have an inverse relationship. - The measured voltage of the photoresistor while in the circuit under different conditions was found to be:Table 2: Voltage across the PhotoresistorLight Level Voltage (V)Covered with Cardstock (Dark) 2.42 VAmbient Light (Neutral) .852 VFlashlight (High) .113 VFrom these results, we can conclude that as the light level increases, the voltage decreases. As the light level decreases, the voltage increases. 1.4.2- The measured resistance of the thermistor under different conditions was found to be:Table 3: Resistance of the ThermistorTemperature Resistance (k)Ambient Temperature (Neutral) 11.4 kRubbed Between Palms (Warm) 9.4 kFrom these results, we can conclude that as the temperature increases, the resistance decreases. - The measured voltage of the thermistor while in the circuit under different conditions was found to be:Table 4: Voltage across the ThermistorTemperature Voltage (V)Ambient Temperature (Neutral) 2.6 VRubbed Between Palms (Warm) 2.05 VFrom these results, we can conclude that as the temperature increases, the voltage decreases.A practical device that can utilize a circuit that contains a photoresistor would be a night-light in achild’s bedroom. When the main light is turned off, there is less light so the photoresistor causesthe voltage in the circuit to increase, thus turning on the night-light. When the main light isswitched back on, the voltage in the circuit will decrease, shutting the night-light off. V. Conclusion In conclusion, we found that photoresistors have an inverse relationship between light level andresistance, as well as an inverse relationship between light level and voltage. Thermistors have aninverse relationship between temperature and resistance, and also an inverse relationship betweentemperature and voltage. From these experiments, we better understand Ohms Law and