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Q. How is resistance affected by changing the length of a piece of nichrome wire in a simple circuit?

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Introduction

Q. How is resistance affected by changing the length of a piece of nichrome wire in a simple circuit? Problem: I have been asked to investigate how resistance is affected by changing the length of nichrome in a simple circuit. What is resistance? Resistance is anything that slows down the flow of electrons/current. This is called a resistor. Resistors are either small pieces of material or long coiled pieces of wire that don't conduct electricity very well. For example, bulbs do not conduct electricity as well as a piece of copper mainly because copper contains loads of free electrons. Examples of resistors: * Hairdryer * Toaster * Filament in a bulb The filament in a bulb is a great example of a resistor. ...read more.

Middle

When carrying out this experiment there is a number of factors that could affect the investigation. These include: * The length of the wire * The voltage passing through the circuit * Thickness of wire * Type of wire The length of the wire As the length of the wire plays a major part in our investigation we must make sure that we measure the wire very accurately in order to achieve accurate and reliable results. The voltage passing through the circuit We must make sure that the voltage been passed through the circuit stays the same. Otherwise our results will not be accurate or reliable. Thickness of wire As the resistance also plays a major part in the investigation I must make sure that the thickness of the wire remain the same throughout the investigation, otherwise our results will not be correct or accurate. ...read more.

Conclusion

Average Resistance (?) 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 Length of wire (CM) Current (AMPS) Voltage (VOLTS) Resistance (?) Average Resistance (?) 1 0.9 3.93 4.366 4.1014 2 1.04 3.99 3.836 3 0.93 3.79 4.075 4 0.31 3.82 4.198 5 0.95 3.85 4.032 1 0.65 4.70 7.231 7.5278 2 0.62 4.72 7.613 3 0.60 4.70 7.833 4 0.63 4.62 7.333 5 0.62 4.73 7.629 1 0.45 4.79 10.644 10.5934 2 0.46 5.01 10.891 3 0.48 4.88 10.166 4 0.45 4.79 10.578 5 0.45 4.81 10.688 1 0.38 5.40 14.211 14.4264 2 0.36 5.38 14.944 3 0.38 5.36 14.105 4 0.39 5.40 13.850 5 0.36 5.39 14.972 1 0.31 5.74 18.516 18.4414 2 0.30 5.54 18.466 3 0.30 5.62 18.733 4 0.32 5.68 17.750 5 0.31 5.81 18.742 ?? ?? ?? ?? Science Coursework Physics Shane McCudden 12D Mrs Edwards ...read more.

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Response to the question

A very well laid out essay. Results are consistent with decimal places which means that their result calculations will be more accurate. To improve the candidate should have included an evaluation to give insight into how they would have improved ...

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Response to the question

A very well laid out essay. Results are consistent with decimal places which means that their result calculations will be more accurate. To improve the candidate should have included an evaluation to give insight into how they would have improved the experiment and explain why factors they think may have affected their results showing greater scientific understanding of the process. A conclusion would also tie up loose ends and state whether their prediction was correct.

Level of analysis

The candidate explains the concept of resistance very well giving good examples of how this will be tested in their experiment. They also state why resistance varies between materials with good scientific depth. They also accurately define voltage and current. They state which factors may affect the experiment and account for them which is very good to show that they understand factors relating to the experiment and it will also make their results more reliable and accurate. Their prediction is done well. The table is laid out well for results.

Quality of writing

Punctuation, grammar and spelling all to a very good standard. The format of the essay is good, but the glare of the wordart in the table does not look professional.


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