The time constant of an inductive circuit is determined by which two parameters?

The time constant in an inductive circuit is specifically influenced by inductance and resistance. The time constant, often denoted as τ (tau), is defined as the amount of time it takes for the current to reach about 63.2% of its maximum value after a change in voltage is applied, or conversely, to decay to about 36.8% of its initial value when the voltage is removed.

In the context of an inductive circuit, the inductance (measured in henries) dictates how quickly the magnetic field builds up in response to an applied voltage, while the resistance (measured in ohms) determines how much opposition the current experiences as it flows. Together, these parameters effectively govern the rate of change of current in the circuit, which is central to understanding the behavior of inductors in response to varying electrical conditions.

The other options provided do not relate to the time constant in an inductive circuit as directly or accurately. For instance, frequency and capacitance are more relevant to capacitive circuits, while voltage and current pertain to circuit operation but do not define the time constant specifically. Power and energy, while important in electrical systems, do not directly relate to the time constant of an inductive circuit either