IDA201 Relays Flashcard (CRF) - Mr. Graham

Front

What do traditional relays use to mechanically operate the switch?

Back

An electromagnet

Front

What is a newer version of relays that does not use electromagnets?

Back

Solid state relays

Front

Why are relays used?

Back

To ensure complete electrical isolation between circuits

Front

What can be used to control the operation of a relay in the primary circuit? A high capacity load, A solid state relay, A manual switch, a thermostat, or another type of sensor, A secondary circuit

Back

A manual switch, a thermostat, or another type of sensor

Front

What does the secondary circuit contain?

Back

The load which needs to be switched and controlled

Front

What is an example of a load in an electrical circuit?

Back

A fan, a pump, a compressor, or even a light bulb

Front

What generates a magnetic field in the primary side of a circuit? Options: A resistor, A capacitor, An electromagnetic coil, A transformer

Back

An electromagnetic coil

Front

How can we observe the creation of an electromagnetic field by a current-carrying wire? Options: By measuring the voltage across the wire, By placing compasses around the wire, By disconnecting the wire, By cooling the wire

Back

By placing compasses around the wire

Front

How does a solid state relay differ from an electromechanical relay?

Back

It has no moving parts and uses electrical and optical properties of solid-state semiconductors.

Front

What does a normally open relay mean in terms of the load on the secondary side?

Back

The load is off until the circuit is complete on the primary side.