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Physics coursework - resistance of nichrome wire

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Introduction

PHYSICS Name : Shannon Weir Date : Candidate Number: Centre Number: 71705 SKILL AREA P : PLANNING EXPERIMENTAL PROCEDURES THE PROBLEM; we need to find out if the resistance of nichrome wire is affected by the length of the wire. BACKROUND KNOWLEDGE; Electricity is a form of energy. Electricity is the flow of electrons. All matter is made up of atoms, and an atom has a center, called a nucleus. The nucleus contains positively charged particles called protons and uncharged particles called neutrons. In a conductor the property that lets the electricity flow is the free electrons. Resistance is a force caused by free electrons it is measured in ohms, resistance increases if heat is increased. Long wires are more resistant than short wires because there are more electrons in a longer wire. ...read more.

Middle

VARIABLES INDEPENDENT VARIABLES; alter length of wire CONTROLLED VARIABLES; thickness of wire and temperature DEPENDANT VARIABLE; voltage and current meausured. Voltmeter required to measure voltage, ammeter to measure current (amps). Both are needed to find resistance. Voltage = current x resistance APPARATUS; 100cm of nichrome wire, red and black leads, power pack, variable resistor, ammeter, crocodile clips, voltmeter. USING RESULTS; A table of results will be present like this. LENGTH OF WIRE CURRENT VOLTAGE RESISTANCE 1ST 20 40 60 80 100 2ND 20 40 60 80 100 3RD 20 40 60 80 100 Then I will record the averages on a line graph, and put in a line of best fit like so METHOD 1. set up apparatus 2. set the power pack to 2 3. ...read more.

Conclusion

EVALUATING The method used seems to be the best way of performing the investigation, although if it was to be repeated the following improvements would be made: � Carry out the experiment for more lengths, such as 10cm, 30cm etc. This would help to obtain a more reliable set of results. The evidence obtained was reliable, however like I previously said I could have obtained a more reliable set of results by carrying out the experiment for more lengths of wire to reinforce my point that the longer the length of wire the greater the resistance is. Taking all this into account, the results and evidence obtained is sufficient enough to support the conclusion that the longer the length of wire, the more atoms and impurities in the wire are present therefore meaning the resistance is greater. ...read more.

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