Ohm's+Law+Inquiry-+Anand,+Sanjana+&+Yuki

Title of Lab: Ohm's Inquiry Lab

Researchers: Anand Rajagopal, Sanjana Sreenath, Yuki Kurosu

Research Question: What is the relationship between voltage across an Ohmic device and current flowing through the device?

Research: V is directly proportional to I so V= some constant k times the current (I) k=V/I ohm's law states that this ratio of voltage to current is the resistance the resistance of our resistor can be calculated using the resistor color code chart
 * Color bands on the resistor: brown black black gold**



Hypothesis: The current flowing through the device and the voltage across a resistor are directly proportional

Materials: Ammeter, Multimeter, D.C power source, Resistor, leads/ alligator clip wires Procedure: 1) Connect resistor, D.C power source, and Ammeter in series 2) Configure Multimeter as a Voltmeter 3) Connect Voltmeter in parallel with the resistor 4) Set current limit (for the ammeter) to 1.0A 5)Measure current supplied by the D.C power source using the ammeter 6) Measure potential difference across ends of the resistor using the voltmeter 7) Repeat steps 5 and 6 10 more times and record results

Data:
 * Current (amp) || Voltage (Ohm) ||
 * 0 || 0 ||
 * 0.2 || 0.05 ||
 * 0.4 || 0.25 ||
 * 0.6 || 0.5 ||
 * 0.8 || 0.7 ||
 * 1.0 || 0.9 ||
 * 1.2 || 1 ||
 * 1.4 || 1.3 ||
 * 1.6 || 1.5 ||
 * 1.8 || 1.8 ||
 * 2.0 || 1.9 ||

Data Analysis: The graph above shows the relationship between the voltage of the current flowing through the Ohmic device with voltage, measured in volts, on the y axis and current on the x axis, measured in amps. Based off of the data collected we determined that: slope of the line is **1.0068** (V/A) y-intercept is **-0.1068** (V) the equation of the line is **y=1.0068x-0.1068**. percent error is **0.6%.** Sources of error may have been caused by human errors, inconsistent measuring of the ohmic device or certain environmental factors that may have altered the ohmic device's configurations.

Conclusion: Based off of the graph and data collected we concluded that there is indeed a direct relationship between voltage and current. This supports our hypothesis and Ohm's law, which states that resistance=voltage/current (R=V/I). Though the error from our experimentation did not affect our results that drastically, we would change the procedure to take more trials at each data point to eliminate these small flaws. Overall this experiment taught us how Ohm's law was derived and how his theory applies to our everyday life.