Please sir i am worried because I used your readings to plot my graph and my fellow class mates use a reading that is different from mine but our graph has the same structure and we got the same value for the slope in number three, please sir hope no problem if the table varies??
You are 100% right. Nothing to worry about. This is not a school examination. Almost all students using the same reading may even jeopardize their results. The most important thing is that your readings are in line with what is expected.
My question was. what if the range in which our teacher fill in their report form is different from mine or my values in the table is higher or lower than his range or is it that the range of the value is not part of what the teacher will fill in the report form?
Ok. Teachers don't submit values or range of values to WAEC or NECO in physics practicals unlike chemistry, where they submit end point. Let no person make you frightened. Physics practicals are marked with respect to expected variations. That is whether your values are increasing or decreasing uniformly as expected. This means that no set of values is taken as the standard marking scheme but how correct are your values to what is expected. If your teacher tells you that he submitted values to WAEC or NECO, tell him I said it is a white lie.
But sir what if the range of the value that our teacher fill in their report form is lower than mine? Or is it that the teacher is not the one to fill the range that all the values of the students should fall into?.
Your Teacher is the one that would fill the report form that would be packaged with your scripts and used by the examiner (marker) to judge all the students in your school. So your end point " VA " must agree with your teacher's own. If your teacher was not in school the examination day then he must have given the values to a colleague to fill for him. In a situation where the teacher forgets to include the report form, then the examiner (marker) must go through the whole scripts in your school and choose the average of the most random "VA " as the end point to judge all the students in a given school. Now see how it is marked: If your teacher's end point (VA) is 20.30 cm3 Then a student's whose VA is 20.30 + or - 0.10 cm3 scores maximum 8 marks on the table. That is a student whose VA is 20.20 or 20.30 or 20.40. A student whose VA is 20.30 + or - 0.20 cm3 (ie 20.10 or 20.50) scores 6 marks on the table A student whose VA is 20.30 + or - 0.30 cm3 (20.00 or 20.60) scores 4 marks A student whose VA lies 20.30 + or - 0.40 (19.90 or 20.70) scores 2 marks A student whose VA lies 20.30 + or - 0.50 (19.80 or 20.80) scores only 1 mark Any student whose VA lies outside the above mentioned limits ie from 0.60 of the teacher's end point scores zero on the table. Whether you scored maximum 8 marks on the table or zero does not affect your marks on the calculations that follow provided you used the right steps and formula to solve accurately. You guys have been advised over and over again to subscribe to the channel, turn your notification button on and be vigilant and not to start having regrets after the examination. You can never see our videos or post unless you have subscribed and have your notification button turned on. Then tune to the channel as from 10 pm to 11 midnight before the exam date.
No, as the length increases, V decreases. Had it been we were asked to plot V against L, we would have gotten a negative graph and slope. To correct this anomaly, we were asked to find the inverse of V and plot it against L and this gave us an intercept C on the vertical axis which would be the E.M.F of the cell used. The connection of the standard resistor and the Constantan wire is in series. Don't swallow most of the manipulations you see on the you tube as being correct because most of them are wrong. Had it been that the connection between the Constantan wire and the standard resistor is in parallel, then the voltage would have have increased as the length increases provided the voltmeter is connected across both the resistor and the wire. Hope this explanation clarifies your fears. Thanks for your comment
Yes you will. For optics, screen my RU-vid videos, there are three videos I provided for NECO examination on rectangular glass block titled model 1, 2 and 3. One of them is most similar to what you have
Internal resistance of dry cells can vary considerably depending on the chemical constituents of the cell. It can be far higher than the range you specified, which you must have just goggled online. Dry cells are primary cells, supply lower current and are expected to have higher internal resistance. Unless you are talking about an accumulator, which is a secondary cell. Thanks
When you plot a graph and let’s say it’s a straight line graph After drawing your straight line to connect the points on your graph sheet.....extend the line so it can cut across the vertical axis of your graph and check the point in your vertical axis where the line passed through That’s ur intercept
Follow the instructions, do the experiment and measure with a protractor. Put the mid point of the protractor between the two lines, read off the angles and take the difference
Watch the video and listen to the podcast. Yes, we did. You can still use a freshly charged accumulator of 2 V, however the readings would differ but the variations and shape of graph will be the same. The instructions says use two dry cells of EMF 1.5 V each or an accumulator
Who told you that. Stop making fictitious comments based on copying from RU-vidrs or past questions. Use your own data, find the inverse of V and plot against L and see the shape of graph you are going to have. How was the resistor and Constantan wire connected and where was the voltmeter connected. Go to previous comments and replies. You guys go to you tubers and copy manipulations without verifying whether it is right or wrong.
