Sir,
1) The resistance of a parallel c/t consisting of two resistors is 12 ohm,one of the resistance wire breaks and effective R becomes 18 ohms,find the R of of broken wire.

2)Two lamps of 200w 220v and 100w ,220v are connected in series across 22ov supply.Find ratio of I thru them will be ?

3)Two heaters rated at 1000w,250v each are connected in series across a 250v,50hz ac mains.Total P drawn from supply would be ?

4)The resistnce of 100w,220v lap to that of a 100w,110v lamp will be at ___ respective voltages .

 

Hello,

I foun this post in the "completed projects" section.
That section is ONLY for completed projects.

As your post looks like home work, I moved it over here.

Please show us your try to solve the problems.
We will give you hints if you went wrong somewhere.

Bertus

 

Are we supposed to just answer your homework for you?

How about showing your best effort at the answers and we will use that as a starting point to guide you toward the correct answers, assuming that is even needed.

And check the last problem. The phrase "will be at ____ respective voltages" makes no sense. I can think of a couple slightly different phrases that would make sense, but they are just that -- different phrases meaning different things.