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Unformatted text preview: Answer: I 1 = 0 . 353 ,I 2 = 0 . 118 ,I 3 = 0 . 471 hint: The three segments share the same voltage drop, V 1I 1 R 1 = V 2I 2 R 2 = I 3 R 3 but by Kirchoﬀ’s theorem, I 1 + I 2 = I 3 we have 3 unknowns ( I 123 ) and 3 equations, so the problem can be uniquely solved. 1 5. Find the equivalent resistance between points a and b in Figure 2. Answer: 7 . 5Ω hint: R 2 and R 3 are in series, and their combination R 23 is in parallel with R 4 , and the whole triangle is in series with R 1 and R 5 . R ab = R 1 + R 234 + R 5 where R 234 = ( R 2 + R 3 ) R 4 R 2 + R 3 + R 4 6. An uncharged capacitor and a resistor are connected in series to a source of emf. If E = 9 V , C = 20 μF , and R = 100Ω, ﬁnd the time constant of the circuit Answer: 2 ms hint: The time constant doesn’t concern the emf. τ = RC = 2 ms 2 Fig 1 Fig 2 3...
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 Winter '07
 BRIANKEATING
 Current, Energy, Jaguar Racing, Electrical resistance, lowest energy state

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