The formula for total voltage in a series circuit is ____.
A. ET = ER1 = ER2 = ER3 ... = ERn
B. ET = ER1 + ER2 + ER3 ... + ERn
C. 1/ET = 1/ER1 + 1/ER2 + 1/ER3 ... + 1/ERn
D. ET = ER1 - ER2 - ER3 ... - ERn
Answer: B
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A. 90 B. 120 C. 180 D. 200
Rooftop units should be leveled when they are installed so that:
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What diagnostic trouble code (DTC) could be set if the thermostat is defective?
A) P0300 B) P0171 C) P0440 D) P0128
A technician measures a return air temperature at the furnace of 70°F and a supply air temperature of 180°F on a furnace whose temperature rise is rated at 40 to 60°F. The technician should:
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