4. (a) An open switch cannot pass through any current, i.e., I=0, which can be called an open circuit. A closed switch is like a short circuit with a null voltage, i.e., V=0, across its two terminals. Therefore, an open circuit is opposite to a short circuit just as an open switch is opposite to a closed switch. Is it possible for human being to recognize a black box with both the characteristics of an open circuit and a short circuit? For a black box with both the characteristics, I=0 and V=0, how do you call this black box? Is it an open circuit? Is it a short circuit? Is it an open and short circuit? Or is it neither an open circuit nor a short circuit? Please give the reason to support your answer. (8%) (b) Please find out the fault from the all affirmative statements in Question 4(a), and answer those following questions accordingly. (8%) 我看不太懂在问什麽~ 拜托谁可以教教我~ --

※ 发信站: 批踢踢实业坊(ptt.cc) ◆ From: 122.121.205.188