Ohm's Law
BlackBoard Notes
- Notes for 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
- Power on all meters to check battery; set all for hFE before each lab section!
======================= Photo - Click for a Larger Version =============================
Here's the original blackboard image, with resistor color codes explained
======================= First Board Section =============================
- Connect resistors to power supply; measure voltage and current
- Pull connections by the "boot", not the wire!
- Power Supply:
- Don't move 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: |
 |
Ugh!! |
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- Circuit diagram – order out of chaos:
| Without meters: |
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With meters: |
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Ahh!!
Use a Ruler! |
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======================= Third Board Section =============================
- Ohm's Law: V = IR.
- Plot all data on one graph!
- R1 + R2 (sum of the individual resistances) should equal Rset (resistance of both measured at the same time). What does your data show?
======================= Third Board Section =============================
- Correct way to draw resistors:
- Fail the exam!
- The same goes for drawing all circuit elements!
======================= Note: This section is no longer needed, but kept for historical significance! =============================
- 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: 03 Jun 2024
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Canton, NY 13617
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