Problem in physics

[Arslanjaved]

can u tell me when to use P=VI
formula and when to use the other ones
P=I(square)R and P=V(sqaure)/R

 

[CaptainDanger]

It depends on the data you are provided with...

 

[ga7sh]

can u tell me when to use P=VI
formula and when to use the other ones
P=I(square)R and P=V(sqaure)/R

yeah exactly if they give u current and resistence use that .... and so on

 

[Arslanjaved]

question number 34 of June 2006 p1
help me with that which formula to use and what is the logic behind that ?

 

[CaptainDanger]

Find the total current.
V=IR
12=I(3+1)
I=3

Find the voltage dissipated in heater. (3/4)12=9V

Now use the formula P=VI
P=9 into 3= 27W Answer.

You can post your doubts here : AS Physics P1 MCQs Preparation Thread.