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In case of a purely inductive circuit, the current is maximum when:

In case of a purely inductive circuit, the current is maximum when: Correct Answer The applied voltage is zero

  • In a purely inductive (that is infinite capacitance, C = ∞ and zero resistance, R = 0) circuit of L Henry, the voltage and current wave forms are not in-phase.
  • The current always “lags” behind the voltage by 90° as shown in the figure. 

 

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  • The waveforms above show us the instantaneous voltage and instantaneous current across a purely inductive coil as a function of time.
  • Maximum current, Imax occurs at one full quarter of a cycle (90°) after the maximum (peak) value of the voltage.
  • Here the current is shown with its negative maximum value at the start of the voltage cycle and passes through zero increasing to its positive maximum value when the voltage waveform is at its maximum value at 90°.
  • Hence in case of a purely inductive circuit, the current is maximum when the applied voltage is zero

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