Explain the parts of the single-axis and double-axis solar panel tracking system
What will be an ideal response?
The single axis and double axis solar panel tracking system uses a ballscrew or other mechanism that has the ability to move the face of the panel and a specific number of degrees to cause it to track the sun. A motor provides the rotary motion for the ballscrew. Sensors may be included to make the system automated, or it can be moved manually from a table of data indicating the precise location for each day.
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Scientists have made it possible to determine the sex of the embryos prior to implantation
Indicate whether the statement is true or false
Technician A says that ozone can be helpful because it blocks harmful UV rays. Technician B says that ground-level ozone can be irritating in strong concentrations. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician
An LED and its current-limiting resistor are connected to a driving circuit with a peak output of 9 V. The LED has a forward voltage (VF) rating of 1.6 to 2.2 V and a forward current (IF) rating of 15 mA (maximum). Using the 80% guideline, what is the smallest standard-value current limiting resistor needed in the circuit?
A) 720 ? B) 520 ? C) 680 ? D) 570 ?
?Cutting plane lines compared to section lines are:
A. ?dashed B. ?thinner C. ?the same size