What is voltage across A and B?

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#1 21668780 04 Jul 2013 10:45

prabhu Raj prabhu Raj

Anonymous

Post #1
21668780 04 Jul 2013 10:45

Capacitor is fully charged to given volt in figure. Then v2 is applied. What can be Vab?
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#2 21668781 04 Jul 2013 19:17

Alexander Lee Alexander Lee

Anonymous

Post #2
21668781 04 Jul 2013 19:17

assuming v2 is initially off and the capacitor is at voltage (V+V1), then the voltage Vab = V2 + (V+V1) = V2 + Vdiode

if we assume V > 0, V1 > 0 and V2 > 0, then Vab = V2 + (V + V1) which is always greater than V1, so the diode never turns on.

at least this is what i'm thinking. seems like the problem has a few different cases of operation depending on the values of these voltages.
#3 21668782 04 Jul 2013 21:25

Jimmy Babida Jimmy Babida

Anonymous

Post #3
21668782 04 Jul 2013 21:25

Vab= (V+V1)+V2=V1-Vdiode

If; (V+V1)+V2 = 9V and

V1-Vdiode= 6V

then; Vab= 9V . Both are connected in parallel.

If; (V+V1)+V2=6V and

V1-Vdidoe=9V

then; Vab=9V
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