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## Homework Statement

Write down the node-voltage matrix equation for the following circuit. Hence find the total power dissipated. (Hint: replace the emf+series resistance(s) by the Norton equivalents.)

## Homework Equations

n/a

## The Attempt at a Solution

The problem I'm having is that I don't fully understand what is meant by replace the emf+series resistance with the norton equivalent. I have a very weak grasp on norton equivalents, and I'm more comfortable with them when I'm told "with respect to.." and a load resistor. The rest of the problem I'm sure I can do fine but this first part has stumped me. Thanks in advance for any assistance, I really appreciate it.