Question 5 1 pts A step-down transformer is used to step down 110 V from a wall socket to 9.0 V for a radio. If the primary winding has 500 turns, and the radio operates at a current of 500 mA, What is the current through the primary winding in mA? 1mA = 1 x 10 3 A. (Three significant digits) 0.04