When a capacitor is connected in a circuit with a resistor, the amount of time needed to charge the capacitor is called the _____.

A) CR time constant
B) RC time constant
C) CR time variable
D) RC time variable

The time needed to charge a capacitor in a circuit with a resistor is called the RC time constant. It is a measure of the time it takes for the voltage across the capacitor to reach approximately 63.2% of its maximum value after a sudden change in voltage. This time constant is calculated as the product of the resistance (R) and the capacitance (C) in the circuit.