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
Conclusion Questions: ( ½ pt each)
Incandescent light bulbs have a very thin filament that glows when hot. Thin filaments have very high / low resistance. 2.
The 12V battery in your car operates a 25 amp car stereo. What is the resistance of this stereo system? __.48 ohms_________ 3.
A “2D” Maglite flashlight runs on 3.0V. What is the current through the bulb if resistance is 15 Ω ? _.2 amps___________ 4.
How many volts must an iPod charger provide to charge an iPOD using .85 Amps at 35 Ω? _29.75 volts____________ 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? ___________________________________________________________________________________________...
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