What if the initial voltage of a capacitor is 20V?

If the initial voltage of the capacitor at 0s is 20V, would the equation for the voltage of the capacitor at a specific time be; 60 + (20-60)e^ (-t/RC) It's unclear to me what the voltage is on the + terminal of your capacitor.

How do you calculate voltage in a capacitor?

Thus, you see in the equationt that V C is V IN - V IN times the exponential function to the power of time and the RC constant. Basically, the more time that elapses the greater the value of the e function and, thus, the more voltage that builds across the capacitor.

How much voltage does a capacitor discharge?

The amount of voltage that a capacitor discharges to is based on the initial voltage across the capacitor, V 0 and the same exponential function as present in the charging. A capacitor charges up exponentially and discharges exponentially.

How do you calculate the capacitance of a capacitor?

As the voltage being built up across the capacitor decreases, the current decreases. In the 3rd equation on the table, we calculate the capacitance of a capacitor, according to the simple formula, C= Q/V, where C is the capacitance of the capacitor, Q is the charge across the capacitor, and V is the voltage across the capacitor.

What happens if a capacitor is 0 VC T 0?

Since the initial voltage across the capacitor is zero, ( Vc = 0 ) at t = 0 the capacitor appears to be a short circuit to the external circuit and the maximum current flows through the circuit restricted only by the resistor R. Then by using Kirchhoff’s voltage law (KVL), the voltage drops around the circuit are given as:

How many time constants does a capacitor have?

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. The time period taken for the capacitor to reach this 4T point is known as the Transient Period.