The protective devices, such as ground wires, lightning arrestors, circuit breakers, relays are used to: Select one: a. None of the above b. step up the voltage. c. Protect equipment and devices of the power system. O d. step down the voltage.

The protective devices, such as ground wires, lightning arrestors, circuit breakers, relays are used to: Select one: a. None of the above b. step up the voltage. c. Protect equipment and devices of the power system. O d. step down the voltage.

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter16: Installation Of Heating, Cooling, And Refrigeration Systems

Section: Chapter Questions

Problem 11RQ

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Concept explainers

Thermistors

A thermistor is a special type of resistor whose resistance is more temperature-dependent than standard resistors. The resistance of the thermistor decreases with increasing temperature. This is the basic principle of thermistors. This allows the thermistor circuit to detect very small temperature changes that cannot be observed with the Resistance temperature detectors (RTDs) or the thermocouples. Since the resistance of a thermistor is temperature dependent, it can be connected to an electrical circuit to measure body temperature. This high sensitivity to temperature changes makes thermistors very useful for accurately controlling and calibrating temperature measurements. In general, resistance increases with increasing temperature in most metals, but thermistors react negatively.

Question

Note: please solve the correct solution

The protective devices, such as ground
wires, lightning arrestors, circuit breakers,
relays are used to:
Select one:
a. None of the above
b. step up the voltage.
c. Protect equipment and devices of
the power system.
O d. step down the voltage.

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