A transformer is used to step down$110$ V$$from a wall socket to $9\mathrm{.}0$ V$$for a radio.

a$)$ If the primary winding has$500$ turns, how many turns does the secondary winding have?

$$NS $=$ turns

b$)$ If the radio operates at a current of$300$ mA$,$ what is the current through the primary winding?

$$IP $=$mA$$