BHS Physics LAB 17 OHMS LAW BHS Physics
BHS Physics LAB #17 OHM’S LAW
BHS Physics Electrical Circuits • Study of charges in motion – Circuit : pathway for the charges – Current : Rate of flow of charge • Ampheres (A) : unit of current
BHS Physics Electrical Current (I) Measure of Rate of Flow of charge valence electrons Current flow copper “kernels” 18 1 Amp = 1 Coulomb = 6. 25 x 10 e second
BHS Physics Ohm’s Law I a DV DV = R I (RESISTANCE) UNIT OF RESISTANCE IS OHM (W) DV = IR
BHS Physics GOALS 1. TO CONSTRUCT A SIMPLE CIRCUIT 2. TO VERIFY THE RELATIONSHIP BETWEEN: VOLTAGE (V) AND CURRENT(I) 3. TO DETERMINE THE RESISTANCE OF A GIVEN DEVICE 4. TO DETERMINE IF A DEVICE IS “OHMIC” OR “NONOHMIC”
BHS Physics EQUIPMENT 1. 2. 3. 4. 5. 6. 7. CIRCIUT BOARD MULTIMETER POWER SUPPLY AMMETER VOLTMETER RESISTORS CONNECTING LEADS
BHS Physics CIRCUIT DIAGRAM ammeter A + V R DC power supply (variable) voltmeter
BHS Physics CIRCUIT BOARD
BHS Physics CIRCUIT BOARD (bottom view)
BHS Physics
DC POWER SUPPLY BHS Physics ON/OFF black red +
BHS Physics
BHS Physics
BHS Physics
BHS Physics VOLTMETER
BHS Physics PROCEDURE 1. Select 3 manufactured resistors, a homemade resistor and a light bulb. 2. Use the digital multimeter to measure the resistance of each. 3. Place each device in the circuit as diagramed. 4. For each device, increase the voltage from 0 -10 V, measure the current for each voltage. 5. Plot V vs I for each device.
BHS Physics DEVICE TABLE
BHS Physics DATA TABLE
BHS Physics VOLTAGE (V) DEVICE #1: STICK RESISTOR ONE GRAPH FOR EACH DEVICE CURRENT (A)
BHS Physics WRITE-UP • ABSTRACT: – BACKGROUND – METHOD • CIRCUIT DIAGRAM • DATA TABLE • GRAPHS – TRENDLINES – GRAPH ANALYSIS • CONCLUSION
BHS Physics POWER SUPPLY
BHS Physics
BHS Physics
BHS Physics
BHS Physics CIRCUIT DIAGRAM
BHS Physics CIRCUIT DIAGRAM ammeter A V R DC power supply (variable) voltmeter
BHS Physics
BHS Physics
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