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Electricity Investigation

Extracts from this document...

Introduction

SCIENCE COUREWORK Abdullah din Electricity Electricity is the flow of electrons or the flow of charge. For an electric circuit to work there must be a complete circuit, with no gaps. A current that flows in one direction is called a direct current, (d.c.). To help the flow of electricity a good conducting material should be used, such as a metal. A metal is a good conductor because they have a large number of free electrons which allow charge to move freely from one atom to the next. There are 2 main types of circuits, a series circuit and a parallel circuit. In a series circuit the lamps are connected to each other. The flow of charge goes through each component and therefore weakens. Ammeters are used in series circuits only. Parallel circuits are when the components are connected in parallel. When the current is flowing from the negative pole of the battery and hits point x the splits away and branches off. Charge then meets again at point y. The power source for a circuit is a battery. A battery acts like a pump providing chemical energy to push electrons around a circuit. ...read more.

Middle

wires * Be careful with any heavy equipment The variables that I will keep fixed is the temperature of the wire, the cross sectional length of the wire, and the metal of the wire. There are also things such things like the components that I shall use, weather it be the amount of bulbs and batteries. My variable in the experiment will have the most affect on resistance and will be able to conduct a good experiment with good results and understanding. Apparatus:- wires ( 6-8), 2 batteries, 1 bulb, digital ammeter, digital voltmeter, switch, variable resistor. A voltmeter is used in parallel circuits and will measure voltage, the ammeter is in a series circuit and will measure amperes. With my equipment I shall choose digital equipment as they gave an accurate reading to 0.01. Method_:- 1) Begin by gathering all the equipment that you may need. 2) Attach the wires accordingly to construct circuit, Attach the 2 batteries together with 1 wire. 3) From the second battery attach a wire and add an ammeter 4) From the ammeter with another wire attach a bulb. ...read more.

Conclusion

For example at cm the readings was . This proves that when there is a greater length there is more voltage needed for charge to flow and that resistance will occur when the wire length is longer and thinner. EVALUATION In convulsion my prediction has matched my final results. My method did provide a reasonably reliable set of results but did provide a few anomalous results. A reason to why this may of happened is because the readings may not of been taken down accurately, the resistance in the wire was not the same or the experiment was not conducted properly. The final results were the most inaccurate aspect to the experiment. The key variables were controlled. From this experiment I have learnt that as length of wire increases so does the resistance of the wire. To improve the experiment next time I could possibly try different measurements, conduct experiment more scientifically, vary components, and change the key variables. Points for further investigation are into the key variables and conduct more experiments on them and how they add to resistance. I would like to comment that this experiment has made me more aware about the factors that involve resistance and I have gained in knowledge about circuits and how to conduct experiments with circuits. ...read more.

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