WAEC 2023 Physics Practical on Electricity. Metre-bridge, resistance box, Rheostat all in one.
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- Опубліковано 21 сер 2024
- This is physics practical examination guide for waec 2023. this will help teachers and students prepare adequately for physics practical examination. The experiment is on metre-bridge, resistance box, Rheostat, emf of 2v, connecting wires, ammeter, voltmeter.
#learn #physicspractical #youtubephysics #waec2023 #physics.
@vindalsacademy
And av shared your videos 🙌🏾.... Thank you so much
Best ever this man is just too good
Thanks sir
It's really helpful, I really appreciate your effort.❤
Thank you my dear please share the video
Marvelous lecturing
Thank you so much. Please always share the videos
U are doing well to my nephew sir
Thanks 🙏🙏🙏🙏🙏
You can share the videos
👍
Good morning everyone. Let's share the videos to other social media platforms. It will help
Nicely detailed , although I had to go over it 3 times , this us accurate and sufficient 👍good work.
Thank you sir for the lecture
You are welcome my dear
Thanks so much sir, I'm a novice at this but I still get it, sir I must say you are doing a great job
Thank you my dear. God bless you. Please share the videos
Thanks so so much sir
You did a great job
I was completely a novice in this but this explanation you did,so explanatory has helped me to become am expert
I'm Very Grateful
God Bless You Greatly
Thanks 🙏🙏🙏🙏 a million time. Your type make me want to do more.
But, please don't forget to share this video and subscribe.
Well done sir I really appreciate you
Thanks just share the videos
Love this guy's teaching 👍👍
Thanks my brother
Weldone sir
Thanks my brother. We are in this together.
Will do and thank you 😊😊
Thanks 🙏🙏🙏.
Please share the videos that's the way to thank me. Okay. Enjoy
Finally part 3, thank you
Thanks. Please share the videos
@@vindalsacademy i will
Pls sir i have a question, the values obtained from both optics and meter bridge experiment are meant to be the same values as yours right irrespective of equipment or does each meter bridge have different values ,cos unlike part 1 our values can't be the same because we're using different springs with different stiffnesses ,hw about part 2 and part 3
God bless you, a very nice Job. Can you please send the alternative B solutions. Thanks
Keep up the good work sir
Thanks 🙏🙏🙏🙏🙏
I followed through..
But I = v/r
Current and voltage have direct relationship so I expected their values to respect that but instead your values showed inverse association..
Maybe something went wrong with the reading or so..
All the same I enjoyed everything you did..learnt alot too
Yes, current and voltage have a direct relationship. And both will increase when either the current or voltage is the parameter being varied. But you have to note that it was the resistance that was being varied in the experiment. Resistance has an inverse relationship with current and a direct one with voltage. So, when resistance is being varied, you have to expect a decrease in current and an increase in the volt. I hope this answers your question.
Please i will like to know if a resistance box can be used with a variable d.c power supply?
Yes of course
You did a nice job... But look at the circuit diagram again... Your ammeter is connected to the negative terminal ... The ammeter ought to be connected so that it can measure the current flowing immediately...
Hahahaha
How can you say that
This is great and so helpful Mr. vindals, the battery required in the experiment is 2v and you know must batteries are 1.5v therefore, by connecting the batteries in series will be 3v and by parallel connection will still be 1.5v. however, my question is how can I connect two batteries as you connected yours in the above video to gives 2v?
That is a very intelligent 🧠 question.
You can get a lead-acid accumulator of 2v
@@faithaderibigbe3647 ok thanks faith👍
Faith, u too dey write WAEC? Regards to Victoria and everyone.
I have to order for 2v accumulator for my school
I've watched this over again.
Today, I saw another list of apparatus brought by waec again.
How ?
Question 1.
Half metre rule
Metre rule
Two knife edge of equal height
A string with a loop at each end
Set of masses (50g,100g,150g, 200g and 250g)
G-clamp
Stop watch
Pair of vernier caliper
Question 2
Pyrex beaker of volume about 250cm³ (any heating saucepan of the specified volume can be used)
Lagged calorimeter of volume about 150cm³ with stirrer (calorimeter and storer of thesame material)
Thermometer (-10⁰c to 110⁰c)
Block of metal of mass 100g whose specific heat capacity is known. (High density metals such as copper, brads and steel are highly recommended so that the calorimeter can easily accommodate them)
NB: the mass of the block should be recorded on a card for candidates ad mb
Measuring cylinder capable of delivering at least 250cm³
Supply of tap water in a container
Bunsen burner or source of heat
Lighter/matches
Napkin
50cm long string
Stop watch/clock
Retort stand and clamp.
Question 3
Potentiometer
Centre-zero galvanometer
Jockey
Crocodile clip attached to about 45cm of connecting wire
Key/switch
5ohms standard resistor labelled, R
Metre rule
About 120cm of bare nickel-chromium wire (swg 24) labelled W (Any bare resistance wire of 5ohm per m may be suitable)
2v accumulator or 2 dry cells (1.5V each) connected in series
Connecting wires
Rheostat
Voltmeter
Where did you see this abeg tell me.
@@vindalsacademy they brought it today from waec. It was Labelled B
Alternative B
The ones you did are alternative A.
They brought it today
Good job on waec physics practical for 2023. Please can you assist to perform the practical for Alternative B physics?
Thanks
Please help with alternative B
Just send the white paper. I will run it.
Alternative B.
(Q1) * Half meter rule
* Meter rule
* Two knife edges both of equal height.
* A string with a loop at each end
* Set of masses(50g, 100g, 150g, 200g and 250g).
* G- clamp
* Stopwatch
* Pair of vernier caliper
(Q2) * pyrex beaker of volume about 250cm^3.
* Lagged calorimeter of volume about 150cm^3.
* Thermometer (-10^°C to 110^°C)
* Block of metal of mass 100g whose specific heat capacity is known.
*Measuring cylinder of about 250cm^3
* Supply of tap water
* Bunsen burner
* 50cm long string
* Stopwatch/clock
* Retort stand
(Q3) * Potentiometer
* Center zero galvanometer
* Jockey
* Key
* 5 homs standard resistor labelled, R
* Meter rule
* About 120cm of bare nickel- chromium wire(swg 24) labelled, W
* 2V accumulator or 2 dry cells (1.5V each)
* Connecting wires
* Rheostat
*Voltmeter
Thanks in anticipation
Thank you sooooooo much 🥺.... U don't know what you've done for me
Thanks 🙏🙏🙏🙏
Keep sharing the video
Gooday sir I heared you don't scratch the jockey along you press on it because it will increase the resistance? Is it correct
Yes but why don't we scratch is not to reduce the diameter of a part of the wire. So if I scratch very very gently. Will I cause any problem?
I am not a conventional person.
But sir can you permit me to comment on one of the apparatus?
Go ahead my dear
This is helpful.
Thanks.
But are you saying we should expect the galvanometer?
Yes very important
The truth is there might actually be dormant apparatus
WAEC instruction says the battery should be 2volt, can 3volt be used then stated in the report
It's better we follow Thier instructions. Order for lead acid accumulator of 2V
In the requirement, the didn't ask us to use Galvonameter
Alternate b are galvanometer
You weren't listening
The audio is not takking
Are you sure
There's a way you can use metre bridge without galvanometer in an experiment. Wait and let's see how the question will look like on Tuesday then I will get back to you sir. I'm sorry if I have crossed my boundary
Well the truth is that. It is possible, maybe it will then function as ordinary wire or terminal. But, what I demonstrated was the principle of wheatstone bridge. Where you can use galvanometer to find the balance point inorder to measure the unknown resistor.
I will still maintain that for the principle of wheatstone bridge a galvanometer is a must use.
You must understand what I intend to verify in this experiment.
It is to confirm the resistor 1Ohm labelled R. Okay, no argument. Physics is clear. Is not an opinion, it's Practical
7:51 what if a rheostat is placed at The position of R2 then how would you know the value of the resistance on the rheostat and that of Rx
The metre bridge can still be used without a galvanometer. A meter bridge is a device used to measure unknown electrical resistance by balancing a circuit with a known resistance against it. This can be done by using a battery and a rheostat in the circuit, and measuring the voltage drop across the unknown resistance using a multimeter(which can be a voltmeter and an ammeter) instead of a galvanometer. The balance point can still be found and the value of the unknown resistance can be calculated using the formula of the meter bridge principle.
How is it possible to connect the voltmeter to the resistor box when it is connected to the metre bridge
Well the idea is to record the pd across the variable resistor
What about d accumulator? What did you use
I can send it across to you
@@vindalsacademy please how can I get this 2v accumulator and 1 ohm standard resistor?
Sir pls is these part of verification of ohms law
Yes it's possible. They can come up with anything different from my demonstration
Sir
How did you get l1 and l2
Please which one is the L1
Which part of the video are you referring to let me know I will reply asap
Great job sir.
But how exactly would the rheostat affect our set up?
You didn't watch the video well. Maybe you can go back and watch full video
I did!! What i mean is would the question give us a certain amount of current we would vary our rheostat to find and then leave the rheostat in that position for the whole practical?
Yes. It would be stated. Using the Rheostat, set the current to .....Ampere. But we don't know yet. But we wait for them
Okay, thanks for the clarification.
You don't need to use a galvanometer. It's not even part of the requirements
Please sir, can I use 3v battery? I can't find the 2v in the market. And can I use 2 ohms standard resistor instead of 1ohm?
According to Ohm's Law, Voltage and Current are not inversely proportional. They are actually "directly" proportional according to Ohm's Law. The reason your current and voltage were giving inverse values was because your Ammeter was in series and Voltmeter was connected in parallel in your experiment.
I think I was talking about resistance. However, you can't connect voltmeter in series. It must be connected in parallel with the resistor. Also, since ammeter and voltmeter are moving inverse. It has a reason to think they don't agree. I know it's because of resistance.
So please enjoy the video.
Pls the arrangement did not work when I tried it today. The connections works but when I remove one resistor from resistance box the voltage and current does not change and the galvanometer is only deflecting towards right and left of the scale whenever I slide the jockey on the bridge......pls what can I do ?
Check the connection of the keys of resistance box. Press the key to be tight. Use fuel and brush to clean some rusted parts. Brush it to remove rusted areas
@@vindalsacademy okay thanks, I will try and do that sir
Yes, you are right according to ohms law current and voltage are directly proportional but his values are actually correct because what is been varied is the resistance. So the values are correct with respect to resistance, cause voltage is directly proportional to resisrance and current is inversely proportional to resistance
Pls , its highly likely the metre bridge would be a dummy in the practical
Let's see how it goes but I will do many and prepare
You tried, but no galvanometer in the instruction. So may not be related to the question that will surface.
How can you use metre-bridge without galvanometer. You people don't pay attention to video before commenting
@@vindalsacademy Metre Bridge will not be used during the practical
Not all apparatus waec send would be used😊
I have tried this, we can use it without Galvonameter
Really. Maybe you can teach me
But sir it not meter bridge that is dere is potentiometer
I taught is for Alternative B
can battery of 2 x 1. 5 V in series be used in place of 2v?
Pls can I used 3volts battery ?
To me it's better we follow instructions
If you are teacher u can use 3v and filled the form with 3v instead of 2v
@@OYEREYI exactly my thought
Okay
You dont slide on the bridge sir
Calm down you can slide. But not too hard.
@@vindalsacademy it is a precaution not to slide. Students can write it as precaution. So, you don't slide so as not to destroy the uniformity of the wire!
You can slide, or punch. But whatever you are doing. You should not be hard to the extent of affecting the wire.
But WAEC didn't ask to provide galvanometer
You did watch the video to the end
Tell me how to use metre-bridge without galvanometer.
Just trying to confuse the student, with meter bridge,is not actually coming in the practical,I guess, they are going funny this days,all there question for the essay today was applied question,so we must not complicate ourselves here.
You should be kind. I am following instructions