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These two formula about voltage's capacitor? When to use Vc = Vi (1 - e ^...

These two formula about voltage's capacitor? When to use Vc = Vi (1 - e ^ -t/RC) ? and when to use Vc = Vi (e ^ -t/RC)? What does a capacitor do? what does capacitor "discharge" mean?

Three resistors with values of 7.0 Ω , 13 Ω , and 19 Ω are connected in series in a circuit with a 8.0 V battery. The total equivalent resistance Rs = 39 Ω. Current in each resistor is I = 0.21 A. At what rate is energy delivered to the 19 Ω resistor? Express your answer using two significant figures.

P = 0.84 W is wrong and P = 3.4 W is also wrong. I used P = I^2 R = (0.21A)^2 (19 Ω) = 0.84 W and it's incorrect.

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