# I3 whatisi2 whichofthefollowingequationsisnotcorrect a

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Unformatted text preview: and pick directions for each current Label the + and – side of each element This is easy for batteries For resistors, the “upstream” side is + Now write down loop and node equations What is I2 ?? V1 R1 ++ - V2 R2 -+ + R3 - - ++ - V3 - I1 I2 I3 Calculation Calculation In this circuit, assume Vi and Ri are known. What is I2 ?? • How many equations do we need to write down in order to solve for I2? (A) 1 (B) 2 (C) 3 (D) 4 (E) 5 • Why?? – – We have 3 unknowns: I1, I2, and I3 We need 3 independent equations to solve for these unknowns BB V1 R1 ++ - V2 R2 -+ + R3 - - ++ - V3 - I1 I2 Calculation Calculation BB In this circuit, assume Vi and Ri are known. I3 What is I2 ?? • Which of the following equations is NOT correct? (A) I2 = I1 + I3 (B) ­ V1 + I1R1 ­ I3R3 + V3 = 0 (C) ­ V3 + I3R3 + I2R2 + V2 = 0 (D) ­ V2 – I2R2 + I1R1 + V1 = 0 • Why?? – –...
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## This document was uploaded on 02/13/2014.

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