FM19 P52 Q1 Flashing Neon Discharge Lamp RC Circuit | A2 Practical Paper 5 | CAIE A Level Physics
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- Опубліковано 3 тра 2021
- 9702/52/F/M/19: A student is investigating the behaviour of a capacitor-resistor circuit as shown in Fig. 1.1. A neon lamp flashes on and off when it is connected across the capacitor with a potential difference VF across the lamp of approximately 90 V.
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The student has a number of unmarked resistors. It is suggested that the period T of the flashes of the lamp is related to the resistance R of the resistor by the expression T = RCK where C is the capacitance of the capacitor and K is a constant.
The constant K is given by K = ln [(Vi - VL)/(Vi - VF)] where Vi is the potential difference across the input, VF is the potential difference required to make the lamp flash and VL is a constant.
Design a laboratory experiment to test the relationship between T and R. Explain how your results could be used to determine a value for K and VL.
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I have a question, do we need to remember all our AS level formulas for Paper 5 too, like Internal resistance and Kirchoff's law?
May I ask if you will also be reviewing Question 2 of this paper? I attempted the question, but I have some problems when it comes to checking if I got the graph right. Thank you.
Hmmm not on the plan at the moment, but you could check the website (see video description) and see if it's already posted there!
Why didnt you connect ammeter and voltmeter in the main circuit to measure resistance? Is making a seperate circuit to measure resistance of resistors necessary?
To measure the potential difference "ACCROSS" a component we connect a voltmeter in parallel with that component
Yea obv across but he means is it going to be connected in the same circuit like put Ammeter in series with R and voltmeter in parallel with R in the same circuit that were making for the experiment or seperately
@@zuhaidk3741yeah you probably can it might be a preference thing
Hi ETphysics, do we need to use a seperate circuit to determine resisitance of R. Can't u just add a rheostat, ammeter, and voltmeter measure R. R=V/I?
Best to use a separate circuit, so that it is not affected by components like the neon lamp!
hey miss, i have a question. lets say that all my values are given in decimal numbers, ( not log or Ln) and i get my values for y axis in decimals too but on the graph the y axis has whole number values.... do i then just change themm alllllll?
Then you've to check what is the smallest step on the y-axis and ask yourself: what does one small box represent?
Miss I was doing one paper, and they mentioned in mark scheme that galvanometer shall be used to measure current and not ammeter in that situation. What can be the reason?
maybe the value of current to be measured is very small so ammeter not appropriate
@@advaithkumar5966 oh! Thanks for telling that🦄⭐ didn't have that in mind. Really helpful⭐
The major difference between an ammeter and a galvanometer is that an ammeter shows only the magnitude of the current, while a galvanometer shows both the direction and magnitude of the current.
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