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Physics, Chemistry and Biology: Post your doubts here!

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Ya thats okay but my question is generally from which chapter do we start studying? And which is the biology text book that i need to follow to achieve my goal in IGCSE? By Authors Mary Jones and Geoff Jones Second edition?? Thanks for ur reference@
You start from the basics like the strutural differences between the plant and animal cell and diffusion and osmosis etc. These things are in the beginning chapters of all books. I suggest that you should use that green coloured biology book for GCSE, it's an excellent book.
 
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i need another help in question 8c M/J 11 paper 32
and plus 10 c
thx in advance

OK :)
For torch lamp,I=0.25 , R=12 ohm (from the question)
For desk lamp, I=0.25 , R=960 ohm (from b )

As mentioned in the question they are now connected in series (both desk & torch lamp), so their total resistance would be :
formula=I1+I2 ,,,,, 690+12=972 ohm so this is the resistance for the circuit.

The voltage of the circuit is 240v as given in the question. So we will find the current.
formula I=V/R, =240/972=0.247A.

Now you just need to compare the current of the whole circuit with the current of each of the lamps.
0.25 > 0.247. So the filament will not melt ... Student Y is correct.
 
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OK :)
For torch lamp,I=0.25 , R=12 ohm (from the question)
For desk lamp, I=0.25 , R=960 ohm (from b )

As mentioned in the question they are now connected in series (both desk & torch lamp), so their total resistance would be :
formula=I1+I2 ,,,,, 690+12=972 ohm so this is the resistance for the circuit.

The voltage of the circuit is 240v as given in the question. So we will find the current.
formula I=V/R, =240/972=0.247A.

Now you just need to compare the current of the whole circuit with the current of each of the lamps.
0.25 > 0.247. So the filament will not melt ... Student Y is correct.

thx again (y)
 
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You start from the basics like the strutural differences between the plant and animal cell and diffusion and osmosis etc. These things are in the beginning chapters of all books. I suggest that you should use that green coloured biology book for GCSE, it's an excellent book.

Could u plz give me the name of the author? Thanks
 
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Assalamu Aleykum Everyone.....

Can anyone please provide me with answers of the End of chapter questions of the IGCSE biology textbook by the author Mary and Geoff Jones..Thanks a lot!

JazakAllah
 
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Assalamu Aleykum Everyone.....

Can anyone please provide me with answers of the End of chapter questions of the IGCSE biology textbook by the author Mary and Geoff Jones..Thanks a lot!

JazakAllah
which chapter are you talking about?
 
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