Investigating the resistance of wires Class practical A simple investigation of the factors affecting the resistance of a wire. Measure it five times to obtain accurate readings. For example, I could use different types of wire instead of using only nichrome.
Measurement of the resistance of the wire B in circuit 2: Measuring the resistance in a short and a long wire gave me a precise data to collect, however if I could have taken more wires with different lengths, my data could have been much more divers that would allow me to make more comparisons to which I could conclude with a more reliable statement.
However, due to my line of enquiry, I will only change the length of the wire. This confirms the first part of my prediction: Attach wire A 20cm to circuit 2 and take readings of the current. I will also ensure that the wire does not heat up too much by confirming that I do not set the voltage too high on the power pack and by maintaining the same the voltage for every reading.
To come across the values of voltage, current and resistance, Georg Ohm discovered the relation between the voltage, current and resistance thus created a formula to determine these values: One end of each resistor is connected to a separate pin and the other ends are all connected together to the remaining common pin — pin 1, at the end identified by the white dot.
Calculate the resistance of wire 1: Thick film resistors are manufactured using screen and stencil printing processes. The points on the graph do not show an accurate and consistent trend, however it also showcases error in the battery eliminator.
That said, another thing you can do is improve the precision of your measurements, e. The next time I do a physics experiment regarding resistance, I would want to conduct surveys of all the factors affecting the resistance and compare to find out the one most affective.
But there may be an equally large water pressure below the pipe, which tries to push water back up through the pipe. The resistive element is made from a mixture of finely powdered carbon and an insulating material, usually ceramic.
Ohm's Law assumed a position of great importance in the nineteenth century when telegraph lines were designed and electrical engineering was developing. The unit of resistance, one volt per amp, is known as the ohm. Apparatus and materials Cells, 1.Sep 14, · The reason being that the "resistance" of the wire is dependent on the length of the wire, the length of the wire is not dependent on the resistance, therefore the length is an independent variable, and the resistance is the joeshammas.com: Resolved.
Independent variable; Dependent variable; Constant(s) Resistivity of a Wire. Name: _____ I. INTRODUCTION.
The resistance of an electrical conductor depends on several factors. Its physical shape is one factor. The type of conductor material is another, as might be expected. That is, two conductors with the same physical shape, but of.
Varistor is a voltage dependent joeshammas.com resistance of a varistor is varied depends on the voltage applied. Here know about varistor circuit with working. Varistor is a voltage dependent joeshammas.com resistance of a varistor is varied depends on the voltage applied.
thin film resistors, metal film resistors), & variable resistors (wire. The resistance of a given object depends primarily on two factors: What material it is made of, and its shape. For a given material, the resistance is inversely proportional to the cross-sectional area; for example, a thick copper wire has lower resistance than an otherwise-identical thin copper wire.
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-sectional area.
The slope reveals that when the length of a wire is increase, the resistance would go up by an approximate measurement of Ω, which could be proven by the calculation of the graph where all the average was calculated from the average increments of each wire — (+++)÷4=Download