16th October 2019

wikipedia
16

What is SSR in reading?

Sustained silent reading (SSR) is a form of school-based recreational reading, or free voluntary reading, where students read silently in a designated time period every day in school. An underlying assumption of SSR is that students learn to read by reading constantly.

Regarding this, can you switch DC with a solid state relay?

A "hockey puck" SSR, so named because of its thick shape and black color. They are specifically designed to switch either AC loads or DC loads, but never both. Solid state relays (SSRs) turn on or off the power being supplied to other devices, in a similar fashion as a physical switch.

What is a contactor and how does it work?

When a relay is used to switch a large amount of electrical power through its contacts, it is designated by a special name: contactor. Contactors typically have multiple contacts, and those contacts are usually (but not always) normally-open, so that power to the load is shut off when the coil is de-energized.

What are electromechanical relays used for?

Electromechanical relays are switches that typically are used to control high power electrical devices. Electromechanical relays are used in many of today's electrical machines when it is vital to control a circuit, either with a low power signal or when multiple circuits must be controlled by one single signal.
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