PHYSICS · Single correct · CBSE · Physics · Alternating Current · Alternating Current
Problem
An ideal mains transformer, working with a supply voltage of 240 V, has 2000 turns on its primary coil and 100 turns on its secondary coil. The transformer is used to operate a laptop computer, through which a current of 4 A flows. The best estimate of the current flowing in the primary coil is
(1) 2 mA.
(2) 20 mA.
(3) 200 mA.
(4) 2 A.