Electricity and D.C. Circuits
$\epsilon = \frac{W}{Q}$
$V = \frac{W}{Q}$
$I = \frac{Q}{t}$
$R = \frac{V}{I}$ (IMPT: It’s ratio, NOT gradient)
$R = \frac{\rho L}{A}$
Series: $R_{total} = R_{1} + R_{2} + …$
Parallel: $\frac{1}{R_{total}} = \frac{1}{R_{1}} + \frac{1}{R_{2}} + …$
$P = VI = I^{2}R = \frac{V^{2}}{R}$
$E = Pt = (VI)t$
Electromagnetic force and Electromagnetic Induction:
Transformer:
$\frac{V_{p}}{V_{s}} = \frac{N_{p}}{N_{s}}$
$V_{p}I_{p} = V_{s}I_{s}$
Operation of transformer:
- Alternating current supplied to primary coil
- Alternating current causes iron core to magnetise and magnetic field to change
- Magnetic fields follow iron core and link to secondary coil
- Hence, emf is induced in the secondary coil by electromagnetic induction due to the changing magnetic fields
Left hand rule for motor:
Right hand rule for generator/dynamo:
Right hand grip rule: (To determine direction of magnetic field/current)
Ways to increase emf in solenoid:
- Use a stronger magnet
- Increase the speed of moving the magnet
- Increase the number of turns in the coil
Ways to increase emf in a.c. generator:
- Decrease distance between magnet and coil
- Use a stronger magnet
- Increase frequency of rotation of the coil (Double freq. = double max. e.m.f. and halving T)
- Increase number of turns in the coil (Double no. of turns = double max e.m.f.)
Radioactivity & The Nuclear Atom
Half life: (n is number of half-life)
$$\frac{N_{\text{final}}}{N_{\text{initial}}} = \left( \frac{1}{2} \right)^{n}$$
very helpful yoo😭🤲🏻✨
Yeah my ol exam is starting in 1 hour and im reading this for the 7th time
exams got cancelled here tho lolll
The small tips make it easier
.
Asante saana
Can’t understand language
Lol same
Thanks alot❤
vewy nice uwu
seriously am really grateful because this is helping me a lot…
Amazing , literally saved me ngl this stuff is really helpful
This is really useful!!
It’s really helpful
It Is a very powerful instrument….
it really is and it makes it all better to understand
Helpful
This is a very helpful learning tool, thanks.
Very Helping….thanks !!!
I needed application of light waves and sound waves to the society at large but it was impossible for me to find
This was really helpful for quick revision right before exams .
Good Bt No Electricity
Page 2 is all about Electricity.
DEAR,I want to print it how can I ?
screenshot then crop and then print
I think I am on the right platform to better my physics up.
I like this. I will be buying MBs to study online.
As a young physicist I love this forum….great Albert decendants
haha
I WANT TO BE BRAVE HOW WILL I DO?
No magnetism or electricity formulas….. insufficiently done
Eat sharks
what about the electrical parts
you guys missed the entire chapter on electrical formulas
Efficiency as well
PAGE 2.
wow!!! tnxs.. d formular are jus ok..
wonderful. this is the way to promote your level in physics.
wonderful physics
Truly Physics unravels the wonders of the world we live. Yes it is wonderful
tnk you.this is very sufficient forum .
Dis is fanatasic …….very good
I like it. So helpful
Please could you make one such for Edexcel AS Physics. .
l Love it
Good Job
Very supportive????????????
I really found physics interesting after I read these
help ful
Really good! Pls include useful power formula thanks!
So helpful
It was really helpful i guess so it is useful for all my friends thanx
Thank you so much!
I have my CIE exam tomorrow, really helped a lot.
thankyou so much!
i have my cie tomorrow.
this was really helpful 😀
Great!There should be more formulas.
Hello, can you suggest formulas to be added to this list?
like formulas from specific heat capacity or latent heat or zero error or graphs of kinematics or electromagnetic spectrum
but this is still very effective i love these notes. have helped me a lot thankyou so much miniphysics
Hello! Thanks for the suggestions! They are added into the list. 🙂
It helped me save a lot of time. I copied all the formulas and practiced question using them. Finding all the formulas in one place helped me finish my revision in 2 hours, other wise it would’ve taken more than 3. Thanks a lot!
Thanks.Having my o levels tomorrow.this helped
Having my pure physics o’s tomorrow this was very helpful! HAHA only started memorising today and this was perfect
Same 🙂 good luck!
Thank you! having my o levels tomorrow :B
hey, i guess you are doing the oct/nov too this year XD, same here , we have physics paper 4 tomorrow
Any way you could upload a downloadable version?
This is very useful for revision.