Title: Describe circuit-control devices.
Course: Electronics/Industrial Robotics Technology (17101-I) > Section: Applying Electronics Fundamentals

Description includes

- construction, number, and location of terminal connections on switches and relays
- operation of switches and relays
- significance of voltage and current ratings
- explanation of abbreviations
  - SPST (single pole, single throw)
  - SPDT (single pole, double throw)
  - DPST (double pole, single throw)
  - DPDT (double pole, double throw)
  - NO (normally open)
  - NC (normally closed)

- illustration of how to hook up three-way switches for two points of control.

Process/Skill Questions:

- What common circuit-control device is used in most heating, ventilation, and air-conditioning (HVAC) systems?
- What is the significance of voltage and current ratings when replacing control devices?
- How is a DPDT switch identified?