Ohm's Law
BlackBoard Notes
- Note to Jeff: They don't measure the resistance directly with an ohmmeter this week! Don't tell them about it!!
- Note: We no longer ask students to determine resistance from color codes, so the fourth board section is no longer needed
- Power on all meters to check battery; set all for hFE before each lab section!
======================= Photo - Click for a Larger Version =============================
======================= First Board Section =============================
- Connect resistors to power supply; measure voltage and current
- Important Notes:
- Wires: Pull connections by the "boot", not the wire!
- Power Supply:
- Don't move the Current knob
- Read all values from multimeters, not power supply
======================= Second Board Section =============================
- Note to Jeff: Put the following circuit sketches all on one board section
- The circuit:
Only Draw A Circuit Diagram!
| Without meters: |
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With meters: |
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Ugh!! |
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- Circuit diagram – order out of chaos:
| Without meters: |
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With meters: |
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Ahh!! |
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======================= Third Board Section =============================
- Correct way to draw resistors:
- Fail the exam!
- The same goes for drawing all circuit elements!
- Ohm's Law: V = IR; plot I vs. V. Plot all data on one graph!
======================= Note: This section is no longer needed! =============================
- Reading resistor color code:
R = 50×10² Ω = 5 kΩ Tolerance ≠ uncertainty! |
Draw this table first!
Resistor Color Code:
0 – Black
1 – Brown
2 – Red
3 – Orange
4 – Yellow
5 – Green
6 – Blue
7 – Violet
8 – Gray
9 – White
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- Lab practical skill: Determine resistance from color codes (do not memorize the colors!)
Return to Setup
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Revised: 13 Feb 2023
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Canton, NY 13617
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