# Physics lab activity 18

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Name ___Sarah Carter___ Wire Resistance and Ohm’s Law

Go to http://phet.colorado.edu/simulations/sims.php?sim=Ohms_Law and click on Run Now.

Wire Resistance and Ohm’s Law

Procedure Part I Wire Resistance: open the PhET Simulation Electricity, Magnets, and Circuits  Resistance in a Wire.
As wire length (cm) increases, the resistance (Ω) ___increases____
As wire area (cm2) increases, the resistance (Ω) ___decreases___
As wire resistivity (Ωcm) increases, the resistance (Ω) ____increases__
Procedure Part II: Ohm’s Law: Electricity, Magnets, and Circuits  Ohm’s Law mA is milliamps, and_1000_ milliamps equals one Ampere.
Move the potential (volts) and resistance (ohms) sliders and observe the current (amps)
As voltage increases, current _increases_.
As resistance increases, current ___decreases___.
Fill out the tables below and check your work in the simulation. ( ½ pt each )
Remember, the simulation shows milliamps.
You should show Amperes V = I * R
8.0 V
.010A
800 Ω
2.0 V
.044 A
45.45Ω
2.5V
.0058 A
430 Ω
6.9V
.069 A
100 Ω
6.4 V
.0213A
300 Ω

Conclusion Questions: ( ½ pt each)
1. Incandescent light bulbs have a very thin filament that glows when hot. Thin filaments have very LOW resistance.
2. The 12V battery in your car operates a 25 amp car stereo. What is the resistance of this stereo system? __0.48 ohms___
3. A “2D” Maglite flashlight runs on 3.0V. What is the current through the bulb if resistance is 15 Ω ? __0.2 amps__
4. How many volts must an iPod charger provide to charge an iPOD using .85 Amps at 35 Ω? ___29.75 V_
5. You need to buy a long extension cord to power a stereo at your spring break BBQ. You need 200feet. You have a 50 ft cord that will work. You rationalize that four such 50 ft cords will do the job. Is this a good idea? Why or Why not? ____________This would not be favorable because using four 50ft cords vs. one 200ft cord would increase the overall resistance and this would result in less voltage

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