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# OCR Gateway Physics P4P5P6 - 18/06/13 Watch

It allows the current to flow through the C and the E, but I have a feeling the current from the B also flows out the E, because the current at the E = the current at the C + the current at the B.

I think we're the victims of GCSE over-simplification again because they don't tell us what happens to the current at the B.
Wait, so does the base current only act as a gate allowing current to flow from the collector to the emitter (rather than the base sending a current to both the emitter and collector)?

Yeah, can't wait until the physics exam is over tomorrow- no more simplification (on the same scale) at A Level!

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2. (Original post by ryanb97)
47
Last years exam..137... Oh I might need a very low A

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In that case I'll (approximately) need a high-A to a low-A* (l'evil ) for my A* overall
3. (Original post by L'Evil Fish)
Well I thought chem was too easy but yeah probably
Think I got over 70 in chem so I should be fine
4. (Original post by BP_Tranquility)
Wait, so does the base current only act as a gate allowing current to flow from the collector to the emitter (rather than the base sending a current to both the emitter and collector)?

Yeah, can't wait until the physics exam is over tomorrow- no more simplification (on the same scale) at A Level!

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Yeah think of it that way, that's good! It metaphorically opens a gate for the current to flow through the C and the E - but don't forget, the current supplied to the B also flows out the E.

We're doing almost identical A levels (I think they actually are identical) so I'll see you on the future threads and we can enjoy the better explained stuff together
5. (Original post by BP_Tranquility)
Wait, so does the base current only act as a gate allowing current to flow from the collector to the emitter (rather than the base sending a current to both the emitter and collector)?

Yeah, can't wait until the physics exam is over tomorrow- no more simplification (on the same scale) at A Level!

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Imagine:

|/
|\

The | bits, are the base, imagine there's no gap between those two || lines... Now when there's a small current, it pushed it connecting the emitter and.collecter. Or the \ and /
6. (Original post by L'Evil Fish)
These boundaries are gonna be incredibly low... I'd say 50 an A* is very likely

I mean even us here were struggling with P6
50 seems high!

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7. (Original post by Zippyzazu)
hahahahahaha yes.

8. So im thinking this is everyones last exam

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In that case I'll (approximately) need a high-A to a low-A* (l'evil ) for my A* overall
I see, thanks- that's it for my last minute revision today

We're both taking the same A levels (I remember talking about it on the chemistry thread)- the only subject where we're on different exam boards is physics

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10. (Original post by L'Evil Fish)
Imagine:

|/
|\

The | bits, are the base, imagine there's no gap between those two || lines... Now when there's a small current, it pushed it connecting the emitter and.collecter. Or the \ and /
That's an interesting way of explaining it- but it makes more sense now, thanks

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11. (Original post by ryanb97)
So im thinking this is everyones last exam

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Na, L'Evil Fish and I both have statistics a week later

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12. (Original post by BP_Tranquility)
Na, L'Evil Fish and I both have statistics a week later

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Try this

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Attached Images

13. (Original post by benwalters1996)
50 seems high!

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I meant sub 50
(Original post by BP_Tranquility)
That's an interesting way of explaining it- but it makes more sense now, thanks

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Np!
(Original post by BP_Tranquility)
Na, L'Evil Fish and I both have statistics a week later

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14. Yay, I've completely finished the CGP question booklet!

My weakest topics are definitely the motor/generator/EM induction ones, they're the most abstract topics so they're harder to understand.
Yay, I've completely finished the CGP question booklet!

My weakest topics are definitely the motor/generator/EM induction ones, they're the most abstract topics so they're harder to understand.
I think mine are lens' and stuff...capacitors

Im going to go over it all now

I dont think the "have a good nighys sleep before the night of your exam" makes a difference to me

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16. (Original post by ryanb97)
Try this

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Can't be bothered to give a full response but this is what is include -
Light- transverse wave with the particles vibrating at 90 degrees to the direction of the wave
Sound- longitudinal wave with particles vibrating parallel to the directions of the wave

Light- longer the wavelength, the lower the frequency. This wave carries less energy but can be used in communications.
Sound- shorter wavelength, high the frequency so the wave carries more energy and can be used in medical applications- eg ultrasound

Amplitude- only affects sound waves (I think)- higher amplitude results in a louder sound

Light waves can travel through vacuum and moves as an EM wave. Sound can't travel through vacuum and moves as vibrating particles containing compressions and rarefactions

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17. (Original post by ryanb97)
Try this

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That's a great question, I hope it comes up! I wrote 2/3rds of a sheet of A4 and still had loads more to write about
18. (Original post by ryanb97)
I think mine are lens' and stuff...capacitors

Im going to go over it all now

I dont think the "have a good nighys sleep before the night of your exam" makes a difference to me

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Me neither, as long as I have coffee in the morning I'll be ready and raring to go!
19. (Original post by BP_Tranquility)

Amplitude- only affects sound waves (I think)- higher amplitude results in a louder sound

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I think a higher amplitude means the wave has more energy, so for light it might make it brighter
20. I'm going to go to sleep now. Good Luck to everyone for the exam!! Thanks everyone for the help in all the sciences

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