For an RC circuit (RC stands for resistor and capacitor), the voltage on the capacitor follows which expression?
1) V = V0 * (1 - e^(-t/RC))
2) V = V0 * e^(-t/RC)
3) V = V0 * (1 + e^(-t/RC))
4) V = V0 * (1 - e^(t/RC))