In a series R-C circuit, the AC current is:

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ALP CBT 2 Electrician Official Paper (Held On: 23 Jan 2019 Shift 3)
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  1. Lagging behind the applied voltage
  2. Leading the applied voltage
  3. Out of phase with applied voltage
  4. In phase with the applied voltage 

Answer (Detailed Solution Below)

Option 2 : Leading the applied voltage
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Detailed Solution

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  • In case of pure resistive circuit, the phase angle between voltage and current is zero i.e. both are in phase.
  • In case of pure capacitive circuit, phase angle is 90° i.e. current leads the voltage by 90°.
  • In case of series RC circuit, the phase angle is resultant of both resistance and capacitance. This will be varies from 0 to 90° based on the values of resistance and capacitance and AC current leads the voltage by an angle in between 0 to 90°
  • In pure inductive circuit, the current lags the voltage by 90°
  • In series RL circuit, the current lags the voltage by an angle in between 0 to 90°
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