A paper feeder of a printer has a plurality of paper feeding paths to feed a printing paper, and a main fed roller feeding the printing paper to an image forming unit of an image forming apparatus. The current sink or source decreases or increases current flowing through the power switch to regulate power switch output current in the event of an overload. The glass fiber is ideal for use as reinforcement for printed wiring boards, and has excellent dielectric properties at frequencies of about 18 GHz or higher. Each ground station on the earth always communicates a satellite within a predetermined position of its apogee, and hence that satellite appears to the ground station to hover over the earth.