Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

Supply voltage (V)

Required number input.

Resistance (ohm)

Required number input.

Inductance (H)

Required number input.

Time (s)

Required number input.

Compute the RL circuit current as it rises toward its steady-state value. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Inductor current (A)

The resulting inductor current returned as a number.

• Inductor calculations depend on core material, air gap, turns, frequency, waveform, temperature, DC bias, copper resistance, skin and proximity effects, fringing, and saturation definition. Small-signal inductance and nominal current rating may not describe switching operation.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• RL Time Constant Calculator

  Compute the RL circuit time constant tau = L / R; the current reaches about 63 percent of its final value after one tau and is effectively settled after five.

• RL Time To Current

  Calculate RL rise time to a target current.

• Dc Motor Armature Current

  Calculate DC motor armature current from applied voltage, back EMF, and winding resistance using the steady-state armature equation.