ISA CONTROLLED ASSESSMENT THERMISTOR ANSWERS Essay

The dependent variable in the experiment was the temperature and energy absorbed by the water.

    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

(a) Based on your observations, what would you expect the voltage read if you touched the DMM across both R1 and R2?

14. The experiment was repeated with each water temperature until all tests had been conclusively completed.

A. Water boils at 100°C at sea level. If the water in this experiment did not boil at 100°C, what could be the reason?

In Lab 8, the time constant of resistance-capacitance was measured in order to determine the charge of a capacitor. This experiment was conducted by setting building a circuit that connects the voltmeter across the resistor. The voltmeter was then connected across the capacitor. The above procedure was conducted several times using different voltages. Afterwards, the results were calculated and tabulated. The data obtained from the lab were the theoretical Tau for 5V, 4V and 3V. In this experiment, the calculated voltage was also determined. The theoretical and the calculated values were then compared and evaluated by determining their percentage errors. For example, in the 5V, the theoretical value was 1.23V; calculated value was 1.434 with a percentage error of 16.6 %( for voltmeter across capacitor).

A. Water boils at 100°C at sea level. If the water in this experiment did not boil at 100°C, what

5. When the circuit gets hotter, what affect does this have on current? Explain using kinetic-molecular theory.

2. Some of the outside variables that could have affected our outcomes for the experiment are the ambient temperature and how quickly the groups took the hot dogs out of the ice water to measure their temperatures. The ambient temperature was 28 degrees Celsius, the coldest temperatures of the hot dogs ranged from 35 to 37 degrees Celsius, so for the groups that measured their hot dogs’ temperature quicker, they gave their hot dogs a head start in the warming process. For groups that were not as quick with their measurements, their hot dogs starting warming up at a later time, so by the time the experiment was over, their temperatures would have been lower than the groups that measured quickly. We did not control these outside variables because we did not increase or decrease the room temperature by turning on the AC.

1. In this sim, what variables are you seeing? Write the formula below, and indicate the units used to measure each one.

1. Using the information provided in the Introduction and your observations from Part 1, hypothesize as to the type of electrolyte the following solutions would be. Justify the hypothesis from a chemical standpoint.

The room temperature was measured throughout the lab and kept constant at 24°C (+/- 1°C), as the lab was conducted during the same time of

Even though the result of an experiment is accurate and matches the literature value, it does not mean that there were no mistakes made. As the difference of the percentage uncertainty and the percentage error suggests there were random errors made. First of them was the heat energy lost to the surrounding environment during the experiment process taking place. This caused the recorded highest temperature to be smaller than the actual highest temperature that was meant to reach. This could have been prevented by adding in more and perfect

y = mx + b format, where in the example, the y-intercept is 500 and the slope is 5, if we expand the equation. Additionally, the domain is x > 0 because it is impossible to have less than 0 Resistances in the game and the range is y > 500, because that is what I set the base to be. We can see that there is a 1% increase in EH per point of Resistance, a linear increase in EH. In the instance of the example graph, I used 500 Health and 0 Resistances as a base. At

The equation implies that the resistance is inversely proportional to cross-section, so doubling the cross section should halve the resistance.