Which of the following best describes how a diode functions in an electrical circuit?
A. current amplifier
B. voltage amplifier
C. relay switch
D. one-way switch
Answer: D
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Canada bluegrass is an unattractive grass
Indicate whether the statement is true or false
A body in motion tends to remain in motion in a straight line unless acted upon by an outside force
Indicate whether the statement is true or false
In a spur gear, the radial distance from pitch circle to top of tooth is called:
a. Circular pitch b. Pitch circle c. Addendum d. Root diameter e. Working depth
Why do air-source heat pumps usually require auxiliary heat?
A) The heat that a heat pump "pumps in" must first be provided by an auxiliary heat source B) Because air-source heat pumps break down a lot C) The heat pump compressor will not start in cold weather unless it is first warmed up D) Because the heating capacity of the unit drops as house heating requirements increase