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SECTION 1.3 CIRCUIT ELEMENTS 15<br />
36<br />
24<br />
p(t) (W)<br />
Figure 1.22<br />
Power waveform for<br />
Example 1.8.<br />
12<br />
5 6<br />
1 2 3 4<br />
7 8 9 10<br />
t (ms)<br />
–12<br />
–24<br />
–36<br />
Learning Assessment<br />
E1.8 The power absorbed by the BOX in Fig. El.8 is<br />
p(t) = 2.5e -4t W. Compute the energy and charge delivered<br />
to the BOX in the time interval 0 6 t 6 250 ms.<br />
50e –t V<br />
+ –<br />
i (t)<br />
BOX<br />
ANSWER: 395.1 mJ,<br />
8.8 mC.<br />
Figure E1.8<br />
E1.9 The energy absorbed by the BOX in Fig. El.9 is given below. Calculate and sketch the current<br />
flowing into the BOX. Also calculate the charge that enters the BOX between 0 and 12 seconds.<br />
i (t)<br />
10 V + BOX<br />
–<br />
w(t) (J)<br />
5<br />
7 8 9 10 11 12<br />
1 2 3 4 5 6<br />
t (s)<br />
–2.5<br />
Figure E1.9
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