An RC time constant reflects the relationship between time, resistance, and capacitance. Describe the relationships. How is the time constant expressed?
What will be an ideal response?
The time it takes a capacitor to charge and discharge is directly proportional to the amount of the resistance and capacitance. The time constant reflects the time required for a capacitor to charge up to 63.2% of the applied voltage or to discharge down to 36.8%. The time constant is expressed as: t = RC.
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A small town purchased a 35 ft diameter cylindrical tank for potable water in the event of an emergency. The town consists of 4 300 family units. If each family were to collect 35 gallons of water, what would be the minimum height of the tank?
What will be an ideal response?
The coil power supply for most relays used in HVACR control circuits is _____.
a. 24VAC b. 24VDC c. 120VAC d. 240VAC
A(n) ____ºF temperature difference from the inside to the outside of the duct is considered the maximum difference allowable before insulation is necessary.
A. 10 B. 15 C. 18 D. 20
Technician A says that electronic calculators have a memory function that can be used to calculate resistance, current, and voltage values for a parallel circuit. Technician B says to separate components of a series-parallel circuit to simplify calculations. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B