Turn on the power and set the power pack to read 0. Throughout the experiment we observed for a number of distinctive things changing either of the variables would have had effects on the results we kept ours all the same each time to ensure a fair test Buy now Physics Coursework Resistance Of A Wire-Evaluation
If there were lots of people counting the bubbles and the results averaged then that would be a more accurate way of obtaining the information necessary. I have chosen to use a meter ruler because the lengths that i will be measuring are to big for a smaller ruler and the meter ruler can be accurate to 1mm. I recorded the lux reading (unit of light intensity) at each distance. When the light is absorbed the plant converts it into energy to photosynthesise. To extend the investigation you could change certain variables for example the type of plant that you are using to count the bubbles from.
I predict that the plastic sheets coloured green, yellow, and orange will produce the least amount of bubbles because the light will be transmitted Physics Coursework Resistance Of A Wire-Evaluation Buy now
The experiment was repeated three times and the results were averaged to ensure they were regular and as expected. From my graph on the previous page, i can see that the resistance of the wire is directly proportional to the length of the wire. If the wire is half the length of a certain wire, it would have has half the number of atoms, this means that the electrons will collide with the atoms half the amount of times. What was the swg (standard wire gauge) or diameter of your wire? I know you stated it was nichrome, and 100 cm long, but the swg is not stated - am using your data as secondary data and need to compare my investigation and yours. The slider on the resistor was moved to allow me to do five repeats Buy Physics Coursework Resistance Of A Wire-Evaluation at a discount
To correct the problem of inaccurate distance measurements, a variable wattage lamp could be used so that as the wattage increases or decreases so to does the light intensity. The more light energy it receives the better and faster it can do this so when the sheets near the blue and red parts of the spectrum are held in front of the elodea it absorbs the light and can photosynthesise better. A grade gcse physics experiment investigation into the effect of parachute surface area in relation to its fall time no html is allowed in comments, but urls will be hyperlinked. I predict that the longer the wire, the larger the resistance. If a length of a wire contains a certain number of atoms when that length is increased, the number of atoms will also increase Buy Online Physics Coursework Resistance Of A Wire-Evaluation
Below are my results from the preliminary experiment (see table 1). Temperature has to be kept at a certain level because if it gets too hot, about 45c then the enzymes in the chlorophyll will be killed and photosynthesis will stop altogether. I will try to make this investigation as accurate as possible. Nb if one were to assume that ohms law applies, then another possible explanation could be that at some points (more likely in the lower lengths), the wire was not allowed to cool completely so that the temperature was higher for that measurement. Take the reading from the ammeter recording both the current and the voltage.
The wire was cut to just over 50cm so the crocodile clips could attach onto the wire, making the results more accurate Buy Physics Coursework Resistance Of A Wire-Evaluation Online at a discount
This in theory would mean that at 50cm there would be a resistance of 1. This means that i am assuming that the temperature is kept constant and that the material is kept constant. I will also ensure that there is a clear indication that the power is isolated by means of a switch and an l. I also wanted to do this experiment to familiarise myself further with the method if i had any problems i could correct them there and then. He plastic sheets were individually wrapped around the beaker with an elastic band.
However, i made sure that the wire remained straight throughout the experiment. This is unlikely to be a problem in this investigation but it might have been an issue had we used batteries instead Physics Coursework Resistance Of A Wire-Evaluation For Sale
Metal wires are made of millions of tiny metal crystals, and each crystals atoms are arranged in a regular pattern. Be careful when the wire is connected, as it will get hot. I will try to make this investigation as accurate as possible. However, using new pieces of wire each time would have been too impractical and time-consuming in the context of this lesson. This is used for a registered author who enrolls in the hubpages earnings program and requests to be paid via paypal.
To remedy these things, i could have used apparatus like a micro-burette or some other tool for measuring small volumes of gas. This helps the energy entering the surface of the leaf to travel a long way through the palisade cells For Sale Physics Coursework Resistance Of A Wire-Evaluation
If the light level is raised the rate of photosynthesis will increase steadily but only to a certain point. Eventually, a level will be reached where an increase in light intensity will have no further effect on the rate of photosynthesis, as there will be another limiting factor, in this case probably temperature. This is indicated on my graph, with the length being 100cm and the resistance being 3. The experiment was repeated three times and the results were averaged to ensure they were regular and as expected. I know this because my results table shows a few, individual anomalous results the anomalous results are at lengths 95cm and 100cm.
Below is a list of factors and reasons why they affect the resistance of a wire Sale Physics Coursework Resistance Of A Wire-Evaluation