Question

A resistor and a capacitor are connected to form an RC circuit. If the resistance of the resistor is increased, the time for the capacitor to charge

A. increases

B. decreases

c. stay the same

Answer 1

If a resistor is connected in series with the capacitor forming an RC circuit, the capacitor will charge up gradually through the resistor until the voltage across the capacitor reaches that of the supply voltage. The time also called the transient response, required for the capacitor to fully charge is equivalent to about 5 time constants or 5T. This transient response time T, is measured in terms of τ = R x C, in seconds, where R is the value of the resistor in ohms and C is the value of the capacitor in Farads. So, if the resistance of the resistor increases, the transient response time that is the time for the capacitor to charge also increases.