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Current Year 12 Thread Mark I (2012-2013)

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The voltage is 1.5V - you've stated it... Unless I've read this completely wrong... Don't over think AS physics, especially the electricity section - it's really that easy...

Edit: what's with the simultaneous equations - you're begin to make me question myself...

yeh but i need to calculate the emf and internal resistance?

the simultaneous equations were used when there were two unknowns, which I thought might be the case in this question too

Reply 7101

silentlife

Original post by g.k.galloway

yeh but i need to calculate the emf and internal resistance?

the simultaneous equations were used when there were two unknowns, which I thought might be the case in this question too

EMF is voltage of power supply. The usual formula is:

\varepsilon=IR+Ir

. Since R is 0 because you've short circuited it and you know that I and

\varepsilon

are 1.5, you can work out internal resistance (r).

(edited 11 years ago)

Reply 7102

TheSnail

Original post by silentlife

EMF is voltage of power supply. The usual formula is:

\varepsilon=IR+Ir

. Since R is 0 because you've short circuited it and you know the I and

\varepsilon

, you can work out internal resistance (r).

aaaahhh thats how the short circuited bit comes in!!!

I've only been doing physics for four days...I'm a little rusty from GCSE :colondollar:

Reply 7103

shyamshah

Original post by justinawe

It's probably normal to be nervous. I don't get nervous easily for some reason... whatever the situation. Even when waiting for exam results, I only get slightly nervous :s-smilie:

Yeah, that is good though, if you can stay like that throughout your life then that is very good!

Original post by mynameisntbobk

First of all, don't freak out. Most of these people will be family or friends, so they won't be judging you. Also, have fun doing it, you're celebrating. You shouldn't really worry, youll adapt to it for sure. I constantly gave speeches last year, so got used to the pressure. Trust me, nothing bad'll happen!

Yeah, I will know some of the people but the thought of 300+ people staring at me while I talk is quite daunting. Still got a week to get ready for it and make myself calm as possible. Were you nervous at first?

Oh yeah, sorry for late reply :wink:

Reply 7104

L'Evil Fish

Original post by mynameisntbobk

Yeah, I'll look this up tomorrow after school

Ooh, okay

My Username is really Poisson Distribution :mmm:

Reply 7105

Robbie242

Original post by Abject Testament

You just check whether the coefficient of the highest power is negative or positive. If it's negative, then you have a negative curve. Like this question, the highest power is

x^3

, the coefficient is positive, therfore the graph of

x^3 + 5x^2 + 4x

starts and ends in the positive quadrants.

oh thats simple thanks!

Reply 7106

mynameisntbobk

Original post by L'Evil Fish

Ooh, okay

My Username is really Poisson Distribution :mmm:

Waterloo road, finishing homework. Eat. Bed. That's tonight for me

Reply 7107

L'Evil Fish

Original post by mynameisntbobk

Waterloo road, finishing homework. Eat. Bed. That's tonight for me

Same!

but I've eaten :smile:

My Username is really Poisson Distribution :mmm:

Reply 7108

mynameisntbobk

Original post by L'Evil Fish

Same!

but I've eaten :smile:

My Username is really Poisson Distribution :mmm:

Already? Wow

Reply 7109

L'Evil Fish

Original post by mynameisntbobk

Already? Wow

I have a weird timetable :tongue:

and I'll probably sleep now :colondollar:

My Username is really Poisson Distribution :mmm:

Reply 7110

Zeionic

If I apply to Wimbledon college is there some special application form I fill it? Or Do I just fill in "Entry for 2013-2014"? plus getting a bad referrence from my tutor 'cos I been Late ;l etc etc