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1. .

Hey, trying to do some prep work but I have absolutely no idea how to do the second and third part of this question, can anyone help me please? Please don't just write the answer I need to understand how it works so any explanation would really help.

Thanks so much.
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Just quoting in Fox Corner so she can move the thread if needed
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(Original post by Fox Corner)
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3. You've gone wrong already I'm afraid... a voltmeter in that position will always read zero because both it's terminals are connected to the same piece of conductor.

what you want to do is connect one terminal of the voltmeter to point A and the other to the zero V supply rail - this will give you the potential difference of point A relative to zero - which it would also be correct to say was the PD across the 4k resistor.

(the other way would be to connect between the +12V rail and point A - which would give you the number of volts by which point A is below 12V... if you take the Pd between 0V and A and the Pd between A and 12V and add them together they must add up to 12V)

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