A high-intensity desk lamp is rated at 45 W but requires only 12 V. It contains a

Question:

A high-intensity desk lamp is rated at 45 W but requires only 12 V. It contains a transformer that converts 120-V household voltage.
(a) Is the transformer step-up or step-down?
(b) What is the current in the secondary coil when the lamp is on?
(c) What is the resistance of the bulb when on?