LAB

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LAB 20OHMS LAW
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Electrical Circuits

• Study of charges in motion
• Circuit pathway for the charges
• Current Rate of flow of charge
• Ampheres (A) unit of current

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Electrical Current (I)

• Measure of Rate of Flow of charge

Current flow
1 Amp 1 Coulomb
second
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Ohms Law
I a DV
DV
R
(RESISTANCE)
I
UNIT OF RESISTANCE IS OHM (W)
DV IR
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GOALS

• TO CONSTRUCT A SIMPLE CIRCUIT
• TO VERIFY THE RELATIONSHIP BETWEEN
• VOLTAGE (V) AND CURRENT(I)
• TO DETERMINE THE RESISTANCE OF A GIVEN DEVICE
• TO DETERMINE IF A DEVICE IS OHMIC OR NONOHMIC

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EQUIPMENT

• CIRCIUT BOARD
• MULTIMETER
• POWER SUPPLY
• AMMETER
• VOLTMETER
• RESISTORS
• CONNECTING LEADS

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CIRCUIT DIAGRAM
voltmeter
V
ammeter
A
R

DC power supply
-
(variable)
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CIRCUIT BOARD
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CIRCUIT BOARD (bottom view)
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DC POWER SUPPLY
black -
ON/OFF
red
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VOLTMETER
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PROCEDURE

• Select 3 manufactured resistors, a homemade
  resistor and a light bulb.
• Use the digital multimeter to measure the
  resistance of each.
• Place each device in the circuit as diagramed.
• For each device, increase the voltage from 0-10V,
  measure the current for each voltage.
• Plot V vs I for each device.

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DEVICE TABLE
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DATA TABLE
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DEVICE 1 STICK RESISTOR
ONE GRAPH FOR EACH DEVICE
VOLTAGE (V)
CURRENT (A)
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WRITE-UP

• ABSTRACT
• BACKGROUND
• METHOD
• CIRCUIT DIAGRAM
• DATA TABLE
• GRAPHS
• TRENDLINES
• GRAPH ANALYSIS
• CONCLUSION