[問題] zero-state response

[htl ( E L I T E)]

╭---12Ω---┬--(switch)--╮
∣          ∣            ∣
∣          ∣            ∣
15V dc      C=1/60 F      8Ω
∣          ∣            ∣
∣          ∣            ∣
╰----------〦------------╯

The switch is on at t=0

And for t>0 15=12*1/60Vc'(t)+Vc(t)

But why don't we have to consider the curren driven by 15V dc?

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