All rights reserved. Printed in the United States of America. Page 4 a word that matches the picture (Listening Comprehension standard score = 84) and generate words within a category, describe scenes, and give directions (Oral Expression standard score = 83).
The power is supplied by a transformer, and when the thermostat makes contact between the 24 volt power and one or two of the other wires, a relay back at the heating/cooling unit activates the corresponding heat/fan/cool function of the unit(s).
An inverter takes in direct-current (DC) powerâin this case, from your carâs 12-volt systemâand converts it to the alternating-current (AC) power required by refrigerators, sump pumps, and most other household devices. That DC to AC conversion isnât as simple as it sounds, however.