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ECN 801 2009 midterm

# ECN 801 2009 midterm - (1 Giventhreeresistors Rr = 40 Q...

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(. (1) Given three resistors + Rr = 40 Q rated 0.5 W Rz = 20 O rated 1.5 W Rs= 10 O rated 1.0 W (a) \Mat is the largest voltage V, that can be safely applied to the series combination of these three resistors ? (b) What is the largest current It that can be safely passed through the series combination of these three resistors ? (c) What is the largest voltage V, that can be safely applied to the Erallel combination of these three resistors ? (d) \Mat is the total equivalent resistance of the parallel combination of the three resistors ? (e) lf resistor R, dissipates 1.5 J of energy in 3 seconds, whatis the voltage V, applied across this resistor ? \ 1 2 I ( o') c ) ( d . ) ( r i ^ ( - . 7 ' ' . ' R = ) 1 3 , 1 , l , = o - , r ) A , ' ; : o . ? ) q n , r \ k , . . : . ' - 1 - L / . t>- v t : . : r 1 1 " , ) : e . / , ) ( 7 , ) ) : - \ r r - , _ ] . g - . r V \ ( t l / ' - \ ' - n - , , ' , f t - , u , - - { . { t v . ' y , ' : 5 - 1 8 v . V r . 3 . r r r t / \ f r - : ( ' - l o . , r , - i - \ . . , ' r , , 2 ' , l t : r , f " ; : 1 . ) l J \ i o - I t f t - - A { , . r 3 > ^ L / ( e ) w vr r_ | . I f : T ' ) V , t l r t , ' r l V t = i 1 6 V I (a) (b) ='i!; = {'6'l L (c) (d) Attach propor units I (1 point each) Vs = ).9,,{ V l s = C t t l A vp= 3,1(V 7 Rrzo= 5-f (Sr- Yz= 3.

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ECN 801 2009 midterm - (1 Giventhreeresistors Rr = 40 Q...

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