Question

How to solve? I tried KCL with variables but the variables kept canceling out.

Answer 1

Pic:

Answer 2

I'll help you, let me mark the voltages

Answer 3

Thank you.

Answer 4

Notice where I've taken ground, with respect to it, voltages are marked

Answer 5

OK

Answer 6

okay how do u solved

Answer 7

Now write node equation at node, marked with voltage V, can you write?

Answer 8

-V+ ((12-V)/2) -4 = 0

Answer 9

Right?

Answer 10

A small error, it'd be
\[\frac{0-V}{1K}+\frac{12-V}{2K}+4 mA=0\]
\[-V+\frac{12-V}{2}+4=0\]
Now find V from this

Answer 11

r u sure ash

Answer 12

yeah, summing all the incoming currents

Answer 13

*outgoing

Answer 14

Omg, I'm doing wrong

Answer 15

Let me rewrite

Answer 16

okay

Answer 17

OK

Answer 18

this is correct, summing all incoming currents
\[-V+\frac{12-V}{2}+4=0\]

Answer 19

Why don't you subtract 4 mA, since it is incoming.

Answer 20

*?

Answer 21

I have all incoming currents

Answer 22

yeah keep going

Answer 23

But why is the first term -V? Shouldn't it be positive V since it is incoming?

Answer 24

A and B are potentials