Qualification > Sciences

Edexcel PHYSICS Doubts

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Malak:
^^ Oh okay..Thankyou :D

Banana:

--- Quote from: ang3l on June 01, 2011, 09:37:54 pm ---GG...Ur awesome :D

I have few more doubts  ::)

In first Q..Why is the answer D?  ???

The last two Qs are of the same sort, just need a basic explanation.

Thanks Alot :)


--- End quote ---

Lol the 1st question is the 1st question of the specimen paper  :) See My Diagram Attached

Suppose the resistance of each resistor is 10 ohm......the total R through line 1 will be 10 ohm and the total R through line 2 will be 20 ohm......

So the current through line 2 will be halved( use the equation V=IR if R doubles, I is halved)

So using the Eq: P= I2 x R for line 2 if the current is halved, the P is quartered....D is the answer

lol....i know its tricky but go in sequence and use the right equatons  ;)

http://imageshack.us/photo/my-images/29/physicsl.jpg

Malak:
Okay...Thx for ur help too :D

Lol..I hate when we have to do all this just for one mark  >:(

And i still didnt do the past papers so I didnt knew this Q is there :P

Malak:
One more doubt..

2009 Jan Q16 (b)

I understand that the voltage is same, and I wrote that A is brighter 'cause more current flows through it as it has less resistance than B.
But I dont get why the MS is relating it to power equations  ???
Is my answer considered wrong or what?  :-\

Thx

Hate electricity chapter  >:(

The Golden Girl =D:

--- Quote from: ang3l on June 02, 2011, 04:05:39 pm ---One more doubt..

2009 Jan Q16 (b)

I understand that the voltage is same, and I wrote that A is brighter 'cause more current flows through it as it has less resistance than B.
But I dont get why the MS is relating it to power equations  ???
Is my answer considered wrong or what?  :-\

Thx

Hate electricity chapter  >:(

--- End quote ---

Usually when a lamp is brighter that's cuz of the Power it dissipates ;) that's why ,Which is why I suggest you write your answer according to the power equations if you don't get it ,let me know :)

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