Biology; Chemistry; Physics: Post your doubts here!

[***amd***]

7, Eng, Math, Islamiat, Phy,Chemistry, Biology, Add math

are u done with all the syllabus of all subjects? if yes, then distinction in maths shouldnt be a big deal for you.

 

[Dark Destination]

What about physics, chemi, bio? Whats the general revision pattern for it. Like final and overall one.

Depends on you.
Again, you need to read the entire book, and then solve past papers, depending on how much time you have.
That's all the preparation is for sciences.

 

[asadalam]

Could Someone wholly explain Q9's every part to me in detail,and give me some help in ray diagrams,or some notes?

 

[asadalam]

Can anyone explain this to me?

 

[Ahmed Aqdam]

Can anyone explain this to me?View attachment 36293

1. The resistor will over heat or burn out as it will be unable to dissipate much higher power than its power rating.
2. The resistor will be larger in size as power rating is higher due to surface area.

 

[Maganius]

Which topics are more important in Magnetism portion?

 

[benjamin123]

free a* quality notes at d2rek.wordpress.com

 

[Talha Farooqui BSS]

Which topics are more important in Magnetism portion?

DC Motor

 

[Dream.Eater]

Could anyone explain to me the purpose of the split ring commutator in a DC motor. I was finding it really difficult to understand.....

 

[Maganius]

DC Motor

Thanks

 

[Dark Destination]

Could anyone explain to me the purpose of the split ring commutator in a DC motor. I was finding it really difficult to understand.....

Reverses the direction of current.

 

[Dream.Eater]

Reverses the direction of current.

Thanks!

 

[Talha Farooqui BSS]

can anyone explain hw to prpre 4 physc ths dz

 

[Salman Shah Jee]

Can Anybody tell me the role of commutators in d.c motor and a.c generator?.....How it helps to let the coil move continuosuly?....I am very confused!!!..:/

 

[Maganius]

Can anyone help me with Electricity portion? (?_?)
I mean which topics should I prepare?

 

[Awesome12]

Could Someone wholly explain Q9's every part to me in detail,and give me some help in ray diagrams,or some notes?

here u go

 

[Awesome12]

Can Anybody tell me the role of commutators in d.c motor and a.c generator?.....How it helps to let the coil move continuosuly?....I am very confused!!!..:/

in a d.c motor, electricity is USED to produce MOTION/CURRENT is used to produce MOTION, when the coil rotates, there has to be something to actually help the coil rotate, which is why there is a split ring commutator
in an a.c motor, MOTION is used to produce CURRENT/ELECTRICITY, using the Fleming's left hand rule, u will notice that on one part of the coil, the force is going down/up (this depends on the direction of magnetic field, and direction of current), and on the other one, it is going up/down. hence the coil rotated automatically, and we don't need a split ring commutator.

here u go

 

[Awesome12]

Can anyone help me with Electricity portion? (?_?)
I mean which topics should I prepare?

what do u mean which topics?
i don't think u shud skip out any topics especially for electricity

 

[Talha Farooqui BSS]

Can Anybody tell me the role of commutators in d.c motor and a.c generator?.....How it helps to let the coil move continuosuly?....I am very confused!!!..:/

You better read the topic 4m bk and keep looking at the diagram side by side. u wl undrstnd dn wrry

 

[Maganius]

what do u mean which topics?
i don't think u shud skip out any topics especially for electricity

SO i should go for each and every topic eh
Okay
Thanks for the help
have you got any good notes on this section?