Title: Examine different types of circuit control devices.
Course: Telecommunications I (10006-I) > Section: Understanding AC/DC Fundamentals

Examination should include

- identifying electrical switches, relays, time-delay relays, and solenoids
- defining the abbreviations SPST, SPDT, DPST, DPDT, NO, and NC
- explaining the significance of voltage ratings, current ratings, and mechanical life ratings
- assembling circuits controlled by various types of switches
- describing the internal structure of relays and solenoids
- examining how electromagnets are employed in relays and solenoids
- assembling circuits that use relays and solenoids.

Process/Skill Questions:

- What is the difference between a DPST switch and a DPDT switch?
- What is the difference between a switch, a relay, and a solenoid?
- Why is it important to understand voltage and current ratings when replacing control devices?