The said scientist hence came up with a rule for working out resistance, shown on the image on the side:Resistance is an important factor to pay attention to because, one, an overly-high resistance can cause a wire to overheat due to the friction that is caused when the electrons move against the opposition of resistance, which is potentially dangerous as it could melt or even set fire. proven.To investigate the relationship � � � � ���� ��f�&� � � v Of course include graphs, tables and … using the same batteries with each of the experiments to ensure the constancy .

decrease in a constant too.

low voltage batteries to avoid the danger of being electrifiedThe following is a table regarding to the results of As you can see, the diagram displays on the It is therefore important to take note of the resistance when dealing with wires to supply power to a device or so. The investigation has concluded that there is a clear relationship between the length and the resistance of a wire, and that the former does in fact affect the latter. one another due to their electron alignment. This is the design overview of the report. Set R at 10 Ohms.

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flow of electrons in the wire, with red being the ions and black ones are being between resistance of a conductor and cross-sectional area of wireThe larger the cross-sectional area This will be a report with multiple experiments, being ... No resistors are used in this experiment, causing the battery to short-circuit, draining all of its energy in just a short amount of time. George Ohm discovered that the potential different of a circuit corresponds to the current flowing thr… Objective: The purpose of this experiment is familiarization of the ohms function of the multi-meter, and exposure to various resistors by use of equipment and various color coded resistors. hypothesis is valid where resistance is directly proportional to length. jY��۷�w�? You are on page 1 of 14. through while much energy loss occurred because of resistance. No resistors are used in this experiment, When coming to measure those two datas, the datas gained from each trial were very inconsistent, which was presumably caused by the inconsistent rubbing with sandpaper, which will be further elaborated in the suggestions for improvements.The pattern on the graph supports the hypothesis of the experiment which predicted that if the length of the wire increased, the resistance measured would increase as well, the graph will observe a positive gradient with the mathematical function of y = mx + c which is supposed to display the increasing amount of resistance. low voltage batteries to avoid the danger of being electrifiedThe You already know that not everything conducts electricity equally well, and that some materials (like copper) resist very little, while others (like rubber) provide enough resistance to effectively prevent the flow of current.

. The resistance of a wire varies according to the four factors of the wire; they are the temperature, material, diameter/thickness and length of the wire. is an increase of voltage and current when the diameter is decreased. A multi-meter should be used to measure the of the voltage and currentIdentifying and changing the types wire

multi-meter to confirm its voltage for an accurate result. This was proven and supported by the trend-line in the graph which basically shows an positive correlation in the increase in resistance in the same rate as the independent variable increases, which is just as the hypothesis predicted. pass through where the charge increases, causing an increase in the current, The maximum error bar that can be identified there is the 4th independent variable, which was the 40cm wire, and the minimum error bar was located in the 1st data, which was the 10cm wire. since V = IR then E = I (R+r) so E/I = R + r Hence: R = E(1/I) - r Therefore R plotted against 1/I has gradient E and intercept -r . resistance, where they have different ways of transferring the electrons from

step 2 and 3 with 0.75m and 1m Nichrome wire Do Theory: The emf of a cell is the total p.d. diameter, there is an increase in the resistance.The decrease of resistance is caused by the number of electrons flowing . � . not connect the circuit by holding the wire and the Nichrome wire with handsUse Plot a graph of R against 1/I. Draw the best possible straight line through the points (they might be quite scattered) in Excel, put the equation of the line on the graph. the line is drawn through the average of two points, giving an accurate answer.Using the multimeter instead of the

A longer wire also means that it would have more atoms, which means it will be more likely for moving electrons to collide with them; hence, higher resistance. Shane Holbrook, Jordon Kurz. current and voltage flowing through the circuitBy 4 0 obj The negative intercept on the y-axis is the internal resistance. � � � � � � � 7! x � : Experiment to find the emf (E) and the internal resistance (r) of a cell Apparatus : 1.5V (approx) cell, Resistance box, Push switch, Digital Ammeter (0-1A). for its sharpness and accuracy in lengthUsage of a variable resistor, as it ammeter where the experiment will be simpler and more accurateUsing diagonal pliers to cut the wire If the length is doubled, it means that the electron must bump

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