ECE35 WIN10 Quiz 2 solution

# ECE35 WIN10 Quiz 2 solution - equivalent resistance R eq...

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QUIZ 2 ECE35 Win’10 NAME _______________________ SID ______________________ For the familiar circuit at right, (1) What voltage does the voltmeter read? V measured = _____________ (2) What is the current i 20 ? i 20 = ____________ Now the voltmeter is replaced by an ideal current meter, connected to the same nodes, A and B. (3) After this replacement, what power will be absorbed by the 20 Ω resistor? P 20 = ____________ Solution: (1) As seen in the homework, all three resistors are connected in parallel, so the
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Unformatted text preview: equivalent resistance R eq = (4 Ω //4 Ω )//2 Ω = 2 Ω //2 Ω = 1 Ω , and V measured = 3 mA * 1 Ω = 3 mV. (2) The two 4 Ω resistors are equivalent to one 2 Ω resistor, and so by current division, half of the 3mA current flows through the 2 Ω resistor, from node A to node B, so I 20 = -1.5 mA (3) An ideal current meter connected to the current source shorts all current through itself, so no current flows through the resistors, and P 20 = 0 W 4 Ω 2 Ω 4 Ω i 20 =? 3mA Voltmeter +-A B...
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