An electric adaptor for a notebook computer (converting 110 volts to 19 volts) operates 10oC warmer than the surroundings, which is at 20. If the output current is measured at 3 amps and heat is lost from the adapter at a rate of 10 W, determine
(a) The energetic efficiency of the device.
(b) The rate of internal entropy generation.
(c) The rate of external entropy generation.