Careful Measurement of Emf and or Internal Resistance of a Cell

If I were given the opportunity to repeat the experiment these are the parts of it that I would change:

The Raw Values Raises Questions in the Forums, Since the Raw Values Might Seem Unstable. Below Are The Raw Values Of The Sensor That I Measured, So You Can Compare Them With Your Own Raw Values.

T= 40ms, I figured this by guessing cause I could not find any information on how to calculate. So I used the equation for t and plugged in different numbers until I got the 10ms that was already given in the table. t= T x 0/360= 40ms x 90/360= 0.01 x 10^-3= 10ms

Batteries store energy in chemical form. They release energy by pumping electrons’ through wires from the minus pole to the plus pole. Devices inbetween convert this energy to another form, Efficieny- e.motor=85%, combustion= 20%

There might have been more KOH solution added to the flask resulting in the observations to be wrong.

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 next step in this lab is to rinse the Erlenmeyer flask with distilled water down the drain and then repeat the experiment, this time adding 10 ml of 0.10M KI and 10 ml of distilled water to the flask instead. The flask should again be swirling to allow the solution to succumb to the same temperature as the water bath and once it has reached the same temperature, 10 ml of 3% H2O2 must then be added and a stopper must be immediately placed on the flask and recording should then begin for experiment two. After recording the times, the Erlenmeyer flask must then be rinsed again with distilled water down the drain. After rinsing the flask, the last part of the lab can now be performed. Experiment three is performed the same way, but instead, 20 ml of 0.10 ml M KI and 5 ml of distilled water will be added and after the swirling of the flask, 5 ml of 3% H2O2 will be added. After the times have been recorded, data collection should now be complete.

\emph{Testing Strategy:} The graph between applied load in the range 0.5 grams to 575.5 grams and change in voltage is plotted. The graph obtained (see Figure~\ref{f:olggraph}) shows the inconsistent readings at many points for different combination of force applied. Also, the best curve equation is close to cubic, which is indication of bad design.\\*

The electrons move because they experience a electric current force in the wire. The battery causes an electric field and the electrons experience a force due to that field. The current flows in the opposite direction of the electrons and the flow of the

My prediction was that the membrane potential will not change and that was wrong because the resting membrane potential changed from -40V to 0V. This happened because K+ diffuse out across the membrane and they leave a net negative charge behind. ___

The experimental error in this lab included the question whether the digital scale was as precise as it could be, how the cooling time affected the water in the hydrates, and any miscalculations that could have occurred. The digital scale could have been more precise since they are more precise scales that could deliver more accurate masses in this lab.

Where Zo is the CPE constant, W is the angular frequency (in rad/s), i2 = -1 is the imaginary number and (n) is the CPE exponent. Based on (n), CPE can represent resistance (n = 0, Zo = R),

4. What are the benefits of using a light bulb as an indication of conductivity? What are the disadvantages? The benefits are: it acts as a confident and direct way of determining whether a solution should be classified as strong, weak, or non-electrolyte. A strong light would indicate a strong electrolyte. A dim light indicates a weak electrolyte, and no light indicates a non-electrolyte. However, the disadvantages are the lack of accuracy in each reading, and conclusions that aren’t necessarily precise. Each reading displays a different level of light for each bulb. Therefore, conductivity

Throughout the practical investigation, there were a variety of safety precautions implemented. This not only prevented physical injury, but allowed the efficient progress of the practical investigation in a safe manner.

Electrical engineers use a lot of products and tools to help them have an easier job. The 2nd article talks about some products, electrical engineers use and explains what they do. One product they use is a “Power analyzer”. The power analyzer is “used to test product efficiency and the design of inverters, lighting systems, uninterruptible power supplies, aircraft power systems, and renewable energy generation products” (Ee Product Picks ). The analyzer test a lot of stuff which helps them waste less time and know if it is too much energy or just the right amount. “The power analyzer was designed for both today's power measurements and the advanced complex requirements of future power conversion products.” ( Ee Product Picks ). Electrical engineers have to use the power analyzer to see if things are safe enough. The product is fast and they will know what the problem is with what they are testing. Electrical engineers have an impact on the world by making sure that energy levels are fine and safe to have in this world by using this helpful tool, but with help, there are also concerns in electrical engineering.