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OCR Gateway Physics P4P5P6 - 18/06/13

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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. :frown:

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)? :redface:

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

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Reply 541

Elcor

Original post by ryanb97

47
Last years exam..137... Oh I might need a very low A :dontknow:

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In that case I'll (approximately) need a high-A to a low-A* (l'evil :wink:

) for my A* overall :biggrin:

Reply 542

Red Fox

Original post by L'Evil Fish

Well I thought chem was too easy :redface:

but yeah probably

Think I got over 70 in chem so I should be fine :smile:

Reply 543

Elcor

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)? :redface:

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

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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 :confused:

) so I'll see you on the future threads and we can enjoy the better explained stuff together :biggrin:

Reply 544

L'Evil Fish

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)? :redface:

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

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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 /

Reply 545

Mutleybm1996

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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Reply 546

dazzer19

Original post by Zippyzazu

hahahahahaha yes. :confused:

Reply 547

ryanb97

So im thinking this is everyones last exam :smug:

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Reply 548

BP_Tranquility

Original post by andersson

In that case I'll (approximately) need a high-A to a low-A* (l'evil :wink:

) for my A* overall :biggrin:

I see, thanks- that's it for my last minute revision today :smile:

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 :redface:

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Reply 549

BP_Tranquility

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 :wink:

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Reply 550

BP_Tranquility

Original post by ryanb97

So im thinking this is everyones last exam :smug:

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

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Reply 551

ryanb97

Original post by BP_Tranquility

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

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Try this

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1371505473199.jpg39.0KB

Reply 552

L'Evil Fish

Original post by benwalters1996

50 seems high!

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I meant sub 50 :smile:

Original post by BP_Tranquility

That's an interesting way of explaining it- but it makes more sense now, thanks :wink:

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Np!

Original post by BP_Tranquility

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

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Reply 553

Elcor

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. :frown:

Reply 554

ryanb97

Original post by andersson

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 :smug:

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Reply 555

BP_Tranquility

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 :tongue:

-
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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(edited 10 years ago)

Reply 556

Elcor

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 :lol:

Reply 557

Elcor

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 :smug: