the telegan law basically states that the total sum of power is zero.

my prof proved lik this:

we choose a node (a point where more then one currents come together)

and decide that the voltage on that node to be zero.

we designate the voltages on the nodes to be

is the current.

is the number of nodes.[/tex]

is the number of branches.[/tex]

each J that does not exist in the graph will be zero.

because by kcl

my problem iswhen he sums for all nodes

he uses

sign which by me represents multiplication

of the sums

why not ,thus we can know that ist the sum of many similar equations.

but how he did it doesnt represent a sum