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Investigation Into electromagnets (Voltage) |
Purpose: |
To design an experiment to determine the strength of an electromagnet in terms of change in voltage. |
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Problem: |
What is the effect on the strength of the magnet, if its voltage is changed? |
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Variables: |
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measured |
- Voltage in volts with a volt meter or check the battery label
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controls |
- Type of wire
- Type of things being attracted by the magnet.
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Hypothesis |
I hypothesize that:
The greater the voltage, the greater the strength of the magnet since there is greater electron flow. |
Assumptions |
The Power supply produces the exact voltage as it is labeled. |
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Materials: |
1 meter of 18-gauge insulated wire
Power supply
Long iron core
Paper clips
Wire strippers
Voltmeter
Lined paper |
Diagram
Figure 1: Proposed setup
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Procedure: |
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1. |
Wrap the wire tightly around the iron core. Leaving about 15 cm of free wire on each end (10 turns first time, 20 turns second time)
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2. |
Strip about 3 cm of the insulation off both ends of the wire, using wire strippers. |
3. |
Secure the ends of the wire to the poles of the power supply. |
4. |
Lay the paper clip and the magnet on a line paper |
5. |
Hold the electromagnet and slowly drag the paperclip towards the magnet until the magnet attracts it. |
6. |
Record the distance by defining the number of lines between the paperclip, spaces between lines are 1cm |
7. |
Repeat steps 1-6 and changing the variables, such as changing the voltage, number of turns of the wire and removing the core.
Remember: Do one variable only for each repeat.
The default is 6.5 volts, 20 turns and with iron core |
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Observation
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Collected data
Voltage (V) |
Distance between magnet and Paperclip (cm) |
6.5 |
2.0 |
13.0 |
3.0 |
3.25 |
1.0 |
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Analysis |
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Sources of Error |
The error in this lab can be the reliability of the power supply to give the constant amount of the given voltage. If the power supply is not consistent, then the amount of voltage produce might not be the one expected, and the distance (responding variable) might not be the correct distance with the corresponding Voltage. |
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