Lab_Number_7

# Close the switch and measure the readings on both the

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Close the switch, and measure the readings on both the ammeter and voltmeter. Then reduce the resistance as it says in the table and record the current and voltage at each new resistance. Then use this data to determine graphically the relationship between voltage and current and the relationship between resistance and power.

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Data: Data Resistence (ohms) Current (amps) Volts (V) Power (J/s) 300 0.008 2.40 0.02 200 0.012 2.20 0.03 100 0.020 1.90 0.04 90 0.021 1.80 0.04 80 0.022 1.75 0.04 70 0.025 1.70 0.04 60 0.028 1.60 0.04 50 0.030 1.50 0.05 48 0.031 1.50 0.05 46 0.032 1.45 0.05 44 0.033 1.40 0.05 42 0.034 1.40 0.05 41 0.034 1.35 0.05 40 0.035 1.35 0.05 39 0.035 1.35 0.05 38 0.035 1.30 0.05 37 0.036 1.30 0.05 36 0.037 1.30 0.05 35 0.037 1.30 0.05 34 0.037 1.25 0.05 33 0.038 1.25 0.05 32 0.039 1.25 0.05 31 0.039 1.20 0.05 30 0.039 1.15 0.04 Analysis: Questions: 1. Form the equations of power with resistance in it, the resistance is in the denominator. That means that the battery has less power with the higher resistance. Therefore a dead battery, one with no power, is characterized to have a high resistance. 2. The formula for voltage is V=IR. So if I goes up, then R goes down and vice-versa. Conclusion:
In conclusion, this lab helped us gain a better understanding of electricity and circuits. In this lab, we learned that the voltage goes up as the current in the system goes down and vice- versa. This shows that voltage and current have an indirect relationship. One goal of the lab though was to determine the relationship between power and resistance. And after thinking about it for a while, I don’t believe that we had enough information to conclude any valid relationship. In my opinion, in order to find a relationship like that, we need to keep the current constant and the voltage constant so that the only thing changing would be the resistance. But that is not how this lab was performed, so therefore we weren’t able to get a completely accurate relationship between the two. Overall though, this lab taught and showed us some very important relationships inside an electrical circuit.
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