Describe how electrons travel in a conductor.
What will be an ideal response?
If electrons are added to one end of a conductor and provision is made to take electrons from the other end, an electric current flows through the conductor. As free electrons move slowly through the conductor, they collide with atoms, knocking other electrons free. These new free electrons travel toward the positive end of the conductor and collide with other atoms. The electrons drift from the negative to the positive end of the conductor because like charges repel. In addition, the positive end of the conductor, which represents a deficiency in electrons, attracts the free electrons because unlike charges attract.
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An air-weather barrier (AWB) is required to be vapor permeable. Why?
What will be an ideal response?
Steel joists are braced against instability by
A) horizontal bridging members at the top of the joists. B) horizontal bridging members at the bottom of the joists. C) A or B. D) A and B. E) none of the above.
The figure below represents what type of circuit?
What will be an ideal response?
The leadscrew system converts ____________________ (linear, rotary) to ____________________ (linear, rotary) motion.
Fill in the blank(s) with the appropriate word(s).