Three electric heating elements are connected in parallel with each other and each element draws 7 A. The supply voltage is 210 V.
a) What is the resistance of each heater?
b) What would the current be through each of the two remaining heaters if one heater burns out?
What will be an ideal response?
a) 30 ?b) 7 A
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Tank heaters are capable of providing a specific amount of hot water per hour, referred to as the ____ rating, based on the tank size, efficiency rating and the fuel type.
A. hourly B. timed C. measured D. first hour
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The R-value of an assembly for air-to-air heat transfer is 20. What is its U-value?
What will be an ideal response?
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A 3-foot 6 inch long rectangular duct is 8 inches wide and 12 inches high and has a welded seam. What is the stretchout length in inches?
Fill in the blank(s) with the appropriate word(s).
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The correct planting depth of a seedling is deep enough so the roots are bent
Indicate whether the statement is true or false.
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