Q3)

A resistor connected to a 100 V dc power supply was consuming

20 W of power until the switch was turned off, after which the

voltage decayed exponentially to zero. If t = 0 is defined as the

time at which the switch was turned to the off position and if

the subsequent voltage variation is given by

v(t) = 100e-21 V

for t≥ 0

(where t is in seconds), determine the total amount of energy

consumed by the resistor after the switch was turned off.