The voltage and current at the terminals of the circuit element ate zero for t < 0 and t > 40 s. In the interval between 0 and 40 s the expressions are
v = t(1 - 0.025t) V, 0 < t <40 s
i = 4 - 0.2t A, 0 < t < 40 s
At what instant of time is the power being extracted from the circuit element maximum?
Calculate the net energy delivered to the circuit at 0, 10 and 20 seconds.