The 2-port admittance matrix of the circuit shown is given by

In the circuit shown, the initial voltages across the capacitors C₁ and C₂ are 1 V and 3 V, respectively. The switch is closed at time t = 0. The total energy dissipated (in Joules) in the resistor R until steady state is reached is _______________.

In the circuit shown, the Norton equivalent resistance (in Ω) across terminals a–b is ___________.

Two casual discrete-time signals $$x\left[ n \right]$$ and $$y\left[ n \right]$$ =$$\sum\limits_{m = 0}^n x \left[ m \right]$$. If the z-transform of y$$\left[ n \right]$$=$${2 \over {z{{(z - 1)}^2}}}$$ , the value of $$x\left[ 2 \right]$$ is _____________________