Observe changes to the equation and wire as you play with the resistivity, length, and area sliders sample learning goals predict how changing each variable will affect the resistance. - investigating the relationship between the length of a wire and its resistance aim: to find the relationship between the length of a wire and it's resistance planning: we conducted a preliminary experiment to help us conduct the real experiment. Well, the relationship is directly proportional: the longer the wire, the stronger its resistance however, if you actually want an experiment to carry out, do the following: equipment needed: voltmeter, ammeter, length of (metallic conductor) wire, crocodile clips, power source, a few cables. You have been given a long length of wire you measure the resistance of the wire, and find it to be r longyou then cut the wire into n identical pieces (intro 1 figure).
Stack exchange network consists of 174 q&a communities including stack overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. C calculate the resistance of the lamp at its running temperature d now, for several different values of pd, measure the current through the lamp plot a graph of your results this graph is known as the voltage-current characteristic of the lamp. For each wire plot a graph of resistance (y-axis) against length the resistance of a wire is given by the equation: r = ρ x l/a where r is resistance, ρ (pronounced 'rho') is the resistivity of the wire, l is length and a is its cross-sectional area.
2 resistance and resistivity the current passing through the material and the voltage that is causing current to °ow are related through the resistance (not the resistivity) by ohm's law as shown. The measured resistance will vary directly with the distance the electrical resistivity is an intrinsic property and should therefore be independent of length and cross-sectional area, but in this activity. 3 students should come to understand that the resistance of a wire depends on its length, its cross sectional area, and the material out of which it is made with some students you could go further and introduce the concept of resistivity ρ, through the relationship r = ρ l / a where r = resistance, ρ = resistivity, l = length and a = cross. Using a copper wire, a standard 1 ω resistor, and a piece of bscco 2223 superconducting tape using liquid nitrogen as the refrigerant, students will measure electrical resistance over a temperature range from -196 °c (77 k) to room temperature, approximately 22 °c (295 k.
From my experiment i have found out that as the length of the wire increases, the resistance of the wire increases at a similar rate, therefore, the rate of increase in the length of a wire is directly proportional to the increase in resistance. As shown by the equation, knowing the length, cross-sectional area and the material that a wire is made of (and thus, its resistivity) allows one to determine the resistance of the wire investigate resistors are one of the more common components in electrical circuits. Episode 112: resistivity in this episode, students learn how and why the resistance of a wire depends on the wire's dimensions they learn the definition of resistivity and use it in calculations. Physics 111 laboratory experiment #3 current, voltage and resistance in series and parallel circuits this experiment is designed to investigate the relationship between current and potential in.
Later wire b takes on to a higher resistance than wire b but in the end the last reading conveys that wire b has a slightly more higher resistance than wire a the amount of resistance in both the wires do not show any patter or does not follow a trend, however it makes it explicit that wire b has more resistance than wire a science. Object: to measure resistance by means of the slide wire wheatstone bridge to study the resis- tance of a wire as a function of length and cross sectional area and to determine the resistiv- ity of two different types of wire. Ie, the resistance between your multimeter probes and the wire itself might have more resistance than your wire and overshadow it my suggestion for the temperature dependent part would be to measure the resistance of the wire with it in boiling water and ice water, for two easy reference points. The length because the wire is thinner than the rest of the wires the electrons wood have more trouble going through for if the wire had the same width there would be no difference, and the longer it is the harder it will be for them so the resistance will go up 2.
Subtract the resistance of the leads to get the resistance r of the wire 4 measure the length l of the wire between the crocodile clips, with the metre stick. Resistivity and conductivity the electrical resistance of a wire would be expected to be greater for a longer wire, less for a wire of larger cross sectional area, and would be expected to depend upon the material out of which the wire is made. Its length - the longer the wire, the greater its resistance its cross-sectional area a - the greater the area, the less its resistance the resistivity of the material r - the greater the resistivity, the greater its resistance. Resistance of a conductor will decrease if its length and temperature remain constant method wire lengths (independent variable) of 20 cm, 40 cm, 60 cm and 80 cm were used.
Science coursework the resistance of a wire aim: to find out how the length of a wire affects the resistance of it knowledge: ohms law is a mathematical equation that shows the relationship between voltage, current and resistance in an electrical circuit. Thanks a2a suppose you have a wire of 10 gm weight and its length is 10 cm now if you increase the length of this wire to 20 cm its resistance r will be twice than it was at 10 cm if 100 people are running through a 20 ft broad passage they will easily get across it, but if the same no of.
For example, if thin wires are to be measured, then a high measuring current would heat the wire and change its resistance value copper wire has a temperature coefficient of 4% per °c at ambient temperatures, so for a wire with a 1ω resistance, raising the temperature by 10°c will increase its value to 10 x 0004 = 004ω. For example, when the length of the wire is 20cm the resistance is 314 ohms when the length of the wire is 40cm the resistance is 618 ohms, which is roughly double in my main investigation i will see if this observation applies to my results. The electrical resistance of an object is a measure of its opposition to the flow of electric current the inverse quantity is electrical conductance, and is the ease with which an electric current passes. Calculate the short circuit isc by measuring the voltage across the 100 mm of resistance wire (resistance 0 1ω) turn the adjusting pot on the lvps to see if the i sc varies.