A schematic can tell an electrician that the switches are normally until the sensor senses smoke
A. locked
B. open
C. charged
D. closed

The earth remains in orbit around the sun due to the force of gravity. how does the force of gravity exerted by the sun on the earth compare to the force of gravity exerted by the earth on the sun?

Which describes increasing the efficiency of energy resource

Positive ions differ from neutral atoms in that