hw 4

Front

What is the basic operating principle of an electromechanical relay (EMR)?

Back

It uses a magnetic field to open or close contacts.

Front

Define normally-open and normally-closed as these terms apply to relays.

Back

Normally-open relays are open when de-energized and closed when energized, while normally-closed relays are closed when de-energized and open when energized.

Front

What are three common uses of relays in electric and electronic circuits? Switching circuits on and off, Amplifying signals, Protecting circuits from overload, Storing data

Back

Switching circuits on and off

Front

What is the coil rating of the electromechanical relay (EMR) with contacts rated for 10A? Options: 100mA, 250mA, 500mA, 1A

Back

250mA

Front

What is one advantage of reed relays?

Back

High switching speed

Front

Concerning a solid-state relay, how is switching of the load circuit accomplished?

Back

By using semiconductor devices

Front

Explain what the function is of a time-delay relay and what two basic groups they can be classified into?

Back

Time-delay relays are used to delay the operation of a circuit. They can be classified into on-delay and off-delay relays.