(Solved): 1. The voltage and current at the terminals of the circuit element in Fig. 1 are zero for t<0. F ...

1. The voltage and current at the terminals of the circuit element in Fig. 1 are zero for $t<0$. For $t?0$ they are $\begin{array}{c}v=50e^{?1600t}?50e^{?400t}V,\\ i=5e^{?1600t}?5e^{?400t}mA.\end{array}$ $<$ Fig. 1. An ideal basic circuit element $>$ a) Find the power at $t=625?\mathrm{s}$. [5] b) How much energy is delivered to the circuit element between 0 and $625?\mathrm{s}$ ? [5] c) Find the total energy delivered to the element. [5] 2. The numerical values for the currents and voltages in the circuit in Fig. 2 are given in Table 1. Find the total power developed in the circuit. [20] $\begin{array}{cc}\text{ ement }\text{ Voltage (V) }& \text{ Current (mA) }\\ 40& ?4\\ ?24& ?4\\ ?16& 4\\ ?80& ?1.5\\ 40& 2.5\\ 120& ?2.5\\ ?\text{ Table 1> }& \end{array}$