Which is a dopant for a semiconductor that conducts electricity due to the movement of positive charges? thallium arsenic phosphorus antimony

Which of the choices below is one of the primary gases found in the atmosphere? a. helium b. carbon dioxide c. nitrogen d. argon

6–43 a food department is kept at 2128c by a refrigerator in an environment at 308c. the total heat gain to the food department is estimated to be 3300 kj/h and the heat rejection in the condenser is 4800 kj/h. determine the power input to the compressor, in kw and the cop of the refrigerator.

The direction of the current in an alternating current circuit remains constant. is direct. changes repeatedly. changes randomly.