Question

For obtaining wattless current,…….  is connected with AC supply.}

Hint:

In an AC circuit, a {pure inductor (L)} or {pure capacitor (C)} results in {wattless current} because the power factor is {zero} (\(\cos 90^\circ = 0\)), meaning no real power is consumed.

Answer 1

Step 1: Understanding Wattless Current 
Wattless current refers to the condition when the power consumed in an AC circuit is zero. The power in an AC circuit is given by: \[ P = VI \cos \phi \] where:
- \( P \) is the power,
- \( V \) is the voltage,
- \( I \) is the current,
- \( \phi \) is the phase difference between voltage and current. 
Step 2: Condition for Wattless Current 
- Power consumption in a circuit depends on the power factor \( \cos \phi \).
- If \( \phi = 90^\circ \), then: \[ \cos 90^\circ = 0 \] which means: \[ P = 0 \] - This happens when the circuit contains a pure inductor (L) or pure capacitor (C), as they store and release energy without dissipating power. 
Step 3: Conclusion 
- A pure inductor (L) or pure capacitor (C) does not consume power but still allows alternating current to flow.
- Since the given question specifically asks for wattless current, the correct answer is only \( L \) (Inductor).