Question 28: AC fundamentals

Question

When an A.C. source is connected to a inductive circuit,

Accepted Answer

The correct answer is
Option B: voltage is ahead of current in phase.
Here's why:
In an inductive circuit, the inductor opposes changes in current. When an AC voltage is applied, the inductor resists the flow of current initially. As the current starts to increase, the inductor builds up a magnetic field around itself, storing energy. This magnetic field opposes the change in current, causing the current to lag behind the voltage.
The relationship between voltage and current in an inductive circuit can be represented by a phase angle (ÃÂ), where:
ÃÂ = 90ÃÂ°
This means that the voltage leads the current by 90 degrees. This phase difference is a fundamental characteristic of inductive circuits.
Let's look at the other options:
Option A: voltage and current are in the same phase.
This is incorrect because, as explained above, the voltage leads the current in an inductive circuit.
Option C: the phase between voltage and current depends upon the value of inductance.
While the inductance value does influence the magnitude of the impedance and the amount of current, it doesn't change the fundamental phase relationship. The voltage will always lead the current by 90 degrees in an ideal inductor.
Option D: voltage lags behind current in phase.
This is incorrect. The voltage leads the current in an inductive circuit.
In summary, in an inductive circuit, the voltage leads the current by 90 degrees due to the inductor's property of opposing changes in current.

Answer

voltage and current are in same phase.

Answer

voltage is ahead of current in phase.

Answer

the phase between voltage and current depends upon the value of inductance

Answer

voltage lags behind current in phase.

AC fundamentals

When an A.C. source is connected to a inductive circuit,

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