Logged ( × \' Bb Course 1 × N Phy 232 Bi Tests &C; Review T B Review T Review Tx

Question

Logged ( × ' Bb Course 1 × N Phy 232 Bi Tests &C; Review T B Review T Review Tx -Review TxYB Review TX e w ]Content o Search C×Tc 15. For TxT Neymar.x N www www.nvcc.edu/home/tstantcheva/232files/232_misc/phy232_au09_exam3b.pdf Problem 4. (8 pt) If R-11 , what is the equivalent resistance between points a and b? Ans.6.6 Problem 5.(10 (a) (4 pt) Determine the current through Ri (b) (6 pt) Determine the resistance R3 pt) If I 1.8 A, El = 30 V, E = 50 V, Ri = 10 , and R2 20 , Ans. 1.6 A to the left Ans. 4.12 £2 R3 R1 is stored in an Problem 6. (4pt) What fraction of the initial energy is stored in an initially charged capacitor after it has been discharging for 3 half-life periods Ans. 1.56 %

Explanation / Answer

the equivalenet resistance for the combination of the THREE resistors is

Req = [R + [(1/R) +(1/R)]-1] = [11 + [(1/11) +(1/11)]-1] = 11+5.5 = 16.5 ohms

This equivalent resitance is connected in parallel with bottom resistance.

R = [1/Req +1 /R]-1 = [(1/16.5) + (1/11)]-1 = 6.6 ohms

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