Resistance in a Wire Coursework

Also, I will hold the test tube by the tip. If I were to grab the test tube with my whole hand, my body heat would be passed onto the test tube causing a temperature increase. Therefore, not creating a reliable set of results.

    One possible source of error that can affect the results was that a mercury thermometer was used instead of an electronic one. The use of a mercury

While the DMM can handle this amount of current, you must learn how to use the ammeter portion of the DMM properly to protect it from blowing a fuse. Shorting voltage sources is dangerous and can damage the DMM.

It had a lot to do with the time and the amount of oxygen evolved. When holding the leveling bulb it seemed that the longer I had to hold it level the harder it became to be as accurate. I would find my arm getting tired and the bulb varying, which would also effect the times that we recorded. Another thing that could have affected our results was not putting the stopper on the Erlenmeyer flask fast enough, fumes from the formation of oxygen could have escaped before we got the stopper on, causing error in the amount and time in which the oxygen was evolved.

The nichrome wire is silver with a sort of rusty brown color on portions of it and is not slightly shiny. When the nichrome wire was put into the heat (bunsen burner), the flame turned from blue to orange, and the wire began glowing orange in the part touching the flame. This was a physical change because the only thing that changed was the color was changed but went back to normal, thus indicating that the composition has not changed.

Use the same Elodea to conduct the other 4 trials for that same temperature, repeat steps 1-5 for each trial.

kindly find below the information for this meters and we will take the reading next week to check and compare between analog and digital meters to get final result

However, this was not the case. Discrepancies occurred between the two sets of values due to experimental errors. Some of the sources of error during the experiment include: drift on the voltmeter that affected the accuracy of measurements (instrumental error), rounding-off errors during calculations and the old resistance box. However, these errors can be eliminated by using a new functional resistance box, recording readings at right angles, and using four decimals in calculations to avoid rounding off errors.

The experiment is repeated twice and an average is obtained. This ensures the consistency of the measurement as the reading is triplicated, thus reducing anomalies. It can be seen that the reading obtained were around the same value. This proves that the results are reliable.

A majority of Americans are constantly worried about bills. One of the bills people are most concerned about is the electricity bill. The electric bill varies each month based on the usage of different electrical uses and appliances. Also, have you ever wondered why when you turn off one light, the light in the other room stays on? Well I will explain the type of electric circuits that is used to ensure that. I will also explain the relationship between what you use and how the duration of use can have an impact the cost of the electric bill.

Increasing the resistivity the resistor gets bigger, which directly effects the current by making it smaller. Indirectly the voltage to push the current through has to be stronger to push the current through. The value of R gets larger, you can change the resistance, but you would have to change out the resistor element to do this.

I also must ensure that the cathode is properly dried before it is weighed so that we can obtain an accurate result. And finally I must make sure that the electrodes are exposed to the same amount of copper sulphate solution so they must be immersed to the same depth and in an equal amount of copper sulphate solution each time.

Lastly, I will be using a piece of string which will be the same piece of string used throughout the experiment.

When tested in the lab, it was found that Advance Wire was mediocre in conductivity & abrasiveness, while also being heavier than all other samples.

In my physics coursework I am going to investigate the effect of the length of a wire on its resistance. Resistance is the measure of how easy it is for current to flow through a wire. Current is the rate of flow of charge through a conductor, and it is measured in amps using an ammeter.