The coil of choke in a circuit

What is the use of choke coil in AC circuit? Can we use a rheostat in place of choke coil for the same purpose?

The purpose of choke in a fluorescent lamp is ,

Assertion : The presence of large magnetic flux through a coil maintains a current in the coil if the circuit is continuous. Reason : Magnetic flux is essential to maintain an induced current in the coil.

A constant current exists in an inductor coil connected to a battery. The coil is short circuited and the battery is removed. Show that the charge flown through the coil aftter the short circuiting is the same as that which flows in one time constant before the short circuiting.

In the steady state condition the rate of heat produced in a choke coil is P . The time constant of the choke coil is tau . If now the choke coil is short circuited, then the total head dissipated in the coil is

Questions based on Power in an ac circuit | Resonant frequency | Choke coil | Oscillation in LC Circuit | RMS Current |Peakcurrent | Instantaneous current

A choke coil is preferred to a rheostate in AC circuit as

[" Which of the following "],[" statements are correct in "],[" the case of choke coil? "],[" A) Choke coil works on the "],[" principle of wattless current "],[" B) A choke coil has high "],[" inductance and low "],[" resistance "],[" C) A choke coil is preferred "],[" to a rheostat in ac circuit as "],[" it consumes almost zero "],[" power "],[" D) Choke coil is used to "],[" control both ac and de "]

An alternating current of frequency 'f' is flowing in a circuit containing a resistance R and a choke L in series. The impedence of this circuit is