Please help

Question

Please help

anonymous · Answer

http://screencast.com/t/lSctJkFTK @theEric

theeric · Answer

Hi! So one important thing that will make this easier is that you can assume that the voltmeter has a really, really high resistance so that it's hardly involved in the circuit. It will be like an open switch:  nothing there.

anonymous · Answer

okay?

anonymous · Answer

which means current doesnt flow through it

theeric · Answer

Pretty much! :)

anonymous · Answer

voltage is zero

theeric · Answer

So, you want to look at the difference in electrical potential between the points. That's what the voltmeter will measure.

anonymous · Answer

how do u calculate that

theeric · Answer

Voltage is not going to be zero, there. Or maybe, but not necessarily...

anonymous · Answer

yeah i got it.. u find the voltage two points up and below and find the difference, the answer is 0.5V

theeric · Answer

Okay!
So, you compare the voltage drops! You start from positive like you did when you traced from X to Y.
So you start with 3V for each branch. Each branch must have a voltage drop of 3V.
The top branch drops it across two equivalent resistors.

... Lemme check! I didn't calculate.

anonymous · Answer

no i found for the resistor one above at the top, and for the resistors right below the top 1, i found the voltage at both points and found the difference

anonymous · Answer

thanks alot :) my answer is correct..would u help me with another question

theeric · Answer

Was .5 correct?

theeric · Answer

I agree. Anyway, post the new question and @ me! If it's not too long, I'll help!

anonymous · Answer

yes it was

anonymous · Answer

i did post, please check :)