Resistance is the measure of how easy it is for current to flow through a wire. While the electric potential difference established between the two terminals encourages the movement of charge, it is resistance that discourages it. The Ammeter must be placed in series with any components because it measured the current passing through it. Although all metals are conductors, some have a higher resistance than the other. The independent variable will be the length of the wire because that is what I will be changing. One such example of this is the temperature of the wire. Electrical resistance is the effect a wire or component has on a current as it tries to prevent the current flowing through it.
Hypothesis : I predict that when the length of a wire is increased, its resistance will also increase. This shows a strong positive correlation, as the trend line is positive. In a short tube, there are less atoms which means there are less to deflect the electron any more speeding the speed up. I will make my test fair by keeping some things the same and changing one thing at a time. I am predicting that this will occur because of the preliminary investigation where we found that in a series circuit resistance wires put together produce a higher resistance. Double the cross section, half the resistance.
These impacts slow down the electrons and can eventually stop their flow. My results also prove the explanation of the free electrons colliding with the stationary ions and electrons in the wire to be correct. . My test was fair because I regularly switched off the power pack to keep the temperature of the wire the same, and I used the same equipment all the way through the investigation. Some of this kinetic energy is changed into heat energy, causing resistance. In the graph there is shown a very strong positive correlation. I could have made some modifications to the circuit to improve on the investigation; I could make the investigation more accurate by using pointers instead of crocodile clips because the pointers would give a more accurate result.
You should be able to! The things that I will keep the same are the temperature of the wire, by switching off the power pack after collecting each set of results, the voltage setting of the power pack, 2 volts, and the equipment, including the wire, that I will use. The potential difference or voltage. The purpose of this investigation is to see how the length of wire affect the dependent variable, resistance. It is important that the voltmeter is set up in parallel and the ammeter in series. Not all materials are created equal in terms of their conductive ability.
My results also prove the explanation of the free electrons colliding with the stationary ions and electrons in the wire to be correct. Movement of charge carriers in any medium must necessarily be subject to such collisions causing loss of kinetic energy and generating heat in the medium. A third variable that is known to affect the resistance to charge flow is the material that a wire is made of. The circuit should be set up as above. The longer the wire the less volts each centimetre of it will get.
Consistent with the discussion above, this equation shows that the resistance of a wire is directly proportional to the length of the wire and inversely proportional to the cross-sectional area of the wire. Power pack -the supply of energy was put to two volts Ammeter -this was connected from the positive side of the power pack to the positive of the ammeter with a lead because this is the best way to get an accurate reading. By changing the variable of the wire, this will enable to see whether resistance is affected, whether it increases or decreases. In the metal wire, there are a number of atoms and free moving electrons. This will ensure that more accurate results are given. Now if the resistance increases, the temperature will also increase because higher the temperature higher will be the vibrations.
Since atoms are far more massive than electrons, the electron loses all forward momentum every time it hits an atom just as we would lose all forward momentum if we ran into a brick wall. The more collisions that happen, the more resistive the piece of wire is. This means I can find and record the resistance. The colors reveal information about the resistance value. I think that the longer wire more electrons slow down as they travel through a because hit fixed atoms of conducting metal in an occurrence called resistance. This is also necessary in order to convince people that the hypothesis allies in real life and not just theoretically.
As in the preliminary experiment, different wires have different resistances but also the length of the wire will affect its resistance. Like the resistance to water flow, total amount of charge flow within a wire an electric circuit is affected by some clearly identifiable variables. Resistance occurs when the electrons travelling along the wire collide with the atoms of the wire. Because there are fewer and fewer nuclei left that can decay. Resistance is calculated by dividing the voltage by the current. It would be interesting to try shorter and shorter lengths although a limit would be reached when the wire begins to heat up. The Width when the wire is very thin its very hard to go through, you can compare it to a person going through a big, or little door, the thinner the door wire the harder it will be to go through it.
This is because the higher the width of the wire, the more space that the electrons will have to move about, resulting in no collisions as there will be a lot of free space. In fact, a 20-Amp circuit is protected by a fuse or circuit breaker that will flip off when the current reaches 20 Amps. It is possible that some measurement may have been slightly out. Within the accuracy of the method used, and for the range of values investigated, it is clear that the length of a wire is proportional to amount of resistance in the wire. Thus, 12-gauge wire is used in circuits which are protected by 20-Amp fuses and circuit breakers. The vibrating atoms having gained this kinetic energy now vibrate more.
I will not go above 1m or below 0. Physics how the length of a wire effect it s. Things that I will measure: Volts - voltmeter Amps - Ammeter Length of the wire Resistance. So, if you double the diameter, you will quarter the resistance. In this particular test there are five main variables. If we set up the equipment exactly the same each time, adjust the constant variables to the right levels and do basically everything the same, this different would either be because of human error or because of a constant variable we had not considered before.