What is the difference between alternating current and direct current?

a. alternating current regularly reverses direction. direct current flows in only one direction.

b. alternating current flows in only one direction. direct current regularly reverses direction.

c. direct current requires insulators, but alternating current does not.

d. alternating current requires insulators, but direct current does not.

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant

The mantle is made up of which structural zones?

Air conditioners not only cool air, but dry it as well. suppose that a room in a home measures 5.0m×9.0m×2.4m . if the outdoor temperature is 30 ∘c and the vapor pressure of water in the air is 85 % of the vapor pressure of water at this temperature, what mass of water must be removed from the air each time the volume of air in the room is cycled through the air conditioner? the vapor pressure for water at 30 ∘c is 31.8 torr.