A circuit with a resistance of 42 Ω and a capacitance of 540 µF is powered by a 3.4 V battery. How much time after the capacitor starts being charged is the instantaneous current in the circuit 15 mA?
What is the time constant of the circuit shown in the diagram? Give your answer to three decimal places.
What is the time constant of a circuit with a resistance of 7.5 kΩ and a capacitance of 450 µF?