Rc Circuit Capacitor Voltage. After a period equivalent to 4 time constants 4t the capacitor in this rc charging circuit is said to be virtually fully charged as the voltage developed across the capacitors plates has now reached 98 of its maximum value 0 98vs. By viewing the circuit as a voltage divider the voltage across the capacitor is.
V r s r r 1 c s v i n s r c s 1 r c s v i n s. This works out to 20 57 volts. Because a capacitor s voltage is in proportion to electric charge q q and the resistor s voltage is in proportion to the rate of change of electric charge current i i their interaction within a circuit produces strange results.
By viewing the circuit as a voltage divider the voltage across the capacitor is.
The time constant τ for an rc circuit is defined to be rc. Ln ϵ c q ϵ c 1 r c t. V c s 1 c s r 1 c s v i n s 1 1 r c s v i n s displaystyle v c s frac frac 1 cs r frac 1 cs v mathrm in s frac 1 1 rcs v mathrm in s and the voltage across the resistor is. In an rc circuit connected to a dc voltage source voltage on the capacitor is initially zero and rises rapidly at first since the initial current is a maximum.
