# O Level Physics Formula List

## 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
• 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:

1. Use a stronger magnet
2. Increase the speed of moving the magnet
3. Increase the number of turns in the coil

Ways to increase emf in a.c. generator:

1. Decrease distance between magnet and coil
2. Use a stronger magnet
3. Increase frequency of rotation of the coil (Double freq. = double max. e.m.f. and halving T)
4. 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)

$$\frac{N_{\text{final}}}{N_{\text{initial}}} = \left( \frac{1}{2} \right)^{n}$$

### 57 thoughts on “O Level Physics Formula List”

1. Asante saana

2. Thanks alot❤

3. vewy nice uwu

4. seriously am really grateful because this is helping me a lot…

5. Amazing , literally saved me ngl this stuff is really helpful

6. This is really useful!!

8. It Is a very powerful instrument….

• it really is and it makes it all better to understand

9. This is a very helpful learning tool, thanks.

• Very Helping….thanks !!!

10. I needed application of light waves and sound waves to the society at large but it was impossible for me to find

11. This was really helpful for quick revision right before exams .

12. Good Bt No Electricity

• Page 2 is all about Electricity.

13. DEAR,I want to print it how can I ?

14. I think I am on the right platform to better my physics up.

15. I like this. I will be buying MBs to study online.

16. As a young physicist I love this forum….great Albert decendants

• haha

17. I WANT TO BE BRAVE HOW WILL I DO?

• No magnetism or electricity formulas….. insufficiently done

• Eat sharks

18. what about the electrical parts

19. you guys missed the entire chapter on electrical formulas

• Efficiency as well

• PAGE 2.

20. wow!!! tnxs.. d formular are jus ok..

21. wonderful. this is the way to promote your level in physics.

22. wonderful physics

• Truly Physics unravels the wonders of the world we live. Yes it is wonderful

• tnk you.this is very sufficient forum .

23. Dis is fanatasic …….very good

24. I like it. So helpful

25. Please could you make one such for Edexcel AS Physics. .

26. Good Job

27. Very supportive????????????

28. I really found physics interesting after I read these

29. help ful

30. Really good! Pls include useful power formula thanks!

31. It was really helpful i guess so it is useful for all my friends thanx

32. Thank you so much!
I have my CIE exam tomorrow, really helped a lot.

33. thankyou so much!
i have my cie tomorrow.

34. 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. 🙂

35. 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!

36. Thanks.Having my o levels tomorrow.this helped

37. Having my pure physics o’s tomorrow this was very helpful! HAHA only started memorising today and this was perfect

• Same 🙂 good luck!