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To investigate how increasing the voltage can affect the flow of current.

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Introduction

Physics coursework Aim: - To investigate how increasing the voltage can affect the flow of current Prediction: - I predict that the higher the voltage the higher the current. If we feed more energy to the coulombs they will push the current around the circuit faster. In order to arrive at this prediction I used the watering can analogy to help me. I.e. I am walking around my garden with a watering can full of water in my hand and the plants I wish to water are at the end of my garden. I represent the Voltage. The watering can represents the coulombs and the water represents the current. ...read more.

Middle

In order to make this a fair test I will keep the thickness of the wire, the length of the wire, and the wire material the same throughout each of the three experiments. Apparatus: - Ammeter, voltmeter, battery, wires and conducting material. Diagram: - Results: - Voltage (V) Current (A) Current (A) Current (A) Average Current (A) rounded to 2dp's 0 0 0 0 0 0.5 0.24 0.26 0.21 0.23 1 0.44 0.46 0.46 0.45 1.5 0.64 0.66 0.67 0.66 2 0.84 0.93 0.92 0.90 2.5 1.08 1.18 1.15 1.14 3 1.28 1.38 1.41 1.36 3.5 1.48 1.63 1.62 1.58 4 1.68 1.86 1.89 1.81 4.5 1.92 2.11 2.12 2.05 5 2.08 2.28 2.33 2.23 Graph: - Conclusion: - I have found that my hypothesis was correct. ...read more.

Conclusion

Although when the voltage got higher I noticed the wire got hotter so the resistance may have changed a little. Evaluation: - I was very pleased with my results as they showed I had conducted the experiment successfully and allowed me to analyse them in detail and therefore arrive at my conclusion. As previously mentioned there were no anomalies so this suggested quality results. I found the procedure involved to arrive at such reliable results was simple. The only adjustments I would consider making would be to have monitored the length of time the circuit was connected up as I found the wires became hot and therefore a hazard. I would also have repeated the experiment more times as I would have been interested to know if the Ohm law applied throughout my results. Sophie Wilson 11H2 ...read more.

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