Explanation
We can use a capacitor of suitable capacitance as a choke coil because average power consumed per cycle in an ideal capacitor is zero. Therefore, like a choke coil, a condenser can reduce ac without power dissipation.
Like direct current, an alternating current also produces magnetic field. But the magnitude and direction of the field goes on changing continuously with time.
Both ac and dc produce heat, which is proportional to square of the current. The reversal of direction of current in ac is immaterial so far as production of heat is concerned.
An ac ammeter is constructed on the basis of heating effect of the electric current. Since heat produced varies as square of current (H = I2R), therefore the division marked on the scale of ac ammeter are not equally spaced.
Since voltage is lagging behind the current, so there must be no inductor in the box.
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