- Level: International Baccalaureate
- Subject: Physics
- Word count: 1167
IB Physics Lab - Resistance
Extracts from this document...
Introduction
Lab Template
On the following pages are a lab template designed for you to organize your lab reports. The last page includes the marking rubric for how you will be assessed.
Here is a quick checklist you should follow for each lab:
- Erase all of the template instructions given, remove bullets and italics unless instructed otherwise
- Write in full sentences, with scientific accuracy. Avoid colloquialisms.
- Include all data points, labeled with units and uncertainties
- Copy and paste graphs from Excel
- Graphs must be labeled with axes, units, and title, and error bars
- All sections of the lab must be completed
- Save your labs digitally, and keep in an organized folder
Name: | |||||||
Course: DP Physics | |||||||
Teacher: | |||||||
Date: 09/13/09 | |||||||
Series and Parallel Circuits | |||||||
Introduction |
2) Equivalent resistance in parallel circuits =
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Objective |
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Hypothesis |
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Materials |
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Procedure | 1. First, we obtained several different resistors, a breadboard, and a multimeter. 2. Then we made 5 different series circuits with different combinations of resistors. 3. Then we calculated the theoretical resistance of each of them and measured the actual resistance using the multimeter. 4. Then we repeated steps 2 and 3 but with parallel circuits. | ||||||
Data Points |
Middle
-1.183%
220Ω (x1)
470Ω (x1)
5th
220Ω (x1)
1.16KΩ
1.15KΩ
-0.869%
470Ω (x2)
Trials | Resistors | Theoretical | Experimental | Percent Error | ||||||
1st | 1KΩ (x1) | 69.7KΩ | 69.8KΩ | 0.14% | ||||||
150Ω (x2) | ||||||||||
2nd | 1KΩ (x1) | 94.4KΩ | 94.0KΩ | -0.42% | ||||||
220Ω (x2) | ||||||||||
2KΩ (x1) | ||||||||||
3rd | 220Ω (x2) | 89.1KΩ | 88.7KΩ | -0.45% | ||||||
470Ω (x1) | ||||||||||
4th | 220Ω (x1) | 72.3KΩ | 72.0KΩ | -0.41% | ||||||
470Ω (x1) | ||||||||||
150Ω (x1) | ||||||||||
2kΩ (x1) | ||||||||||
Conclusion
- The two formulas that were used in this lab and stated in the introduction proved Ohm’s law effective, as the resistance formulas are based on Ohm’s law.
- My initial hypotheses were proven correct as they were that the theoretical equivalent resistance of a series circuit and a parallel circuit will always be slightly more than the experimental equivalent resistance and that when more resistors are added in a circuit, both in series and in parallel, the percent error will increase. This all can be clearly seen on the data tables.
Evaluation
- This is the type of experiment that’s very valid. This is due to the fact that the properties of electricity are constant and that we used precise measuring equipment.
- This experiment virtually doesn’t need any improvements or changes as it achieves it purpose in a quick, efficient way.
- In my opinion, a good further assignment would be to research certain electronically appliances or devices and figure out the resistance of each of them, and find out why that specific resistance is applied to that appliance/device.
This student written piece of work is one of many that can be found in our International Baccalaureate Physics section.
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