Question

how do i apply nodal on this question?

Answer 1

i need to assign the 2 nodes next to Va as V1 and V2?

Answer 2

Is there a resistor below Va?

Answer 3

nope, tats just the error checking line ==

Answer 4

then he two nodes will have the same voltage
Va on both the nodes

Answer 5

*the

Answer 6

oh so the sum flowing out = 0?

Answer 7

out from Va*

Answer 8

yea i think i got it, its very close to my experimental value.

Answer 9

It's easy, summing currents leaving from super node ( the branch with voltage Va)
\[\frac{V_a-E_1}{R_1}+\frac{V_a-0}{R2}+\frac{V_a-0}{R3}+\frac{V_a-E2}{R4}=0\]

Answer 10

oh ic. didnt realise its a super node in the 1st place. not being observant enough

Answer 11

thanks alot =)

Answer 12

you;re welcome;D