Relays

Objectives

  • Explain the difference between a relay and a switch.
  • Demonstrate the mechanics of a relay.
  • Analyze a relay schematic symbol.
  • Predict the behavior of a circuit that utilizes a relay.
Relay
Switch

Relay Vs. Switch

A relay is a specialized version of a switch that is electromechanically triggered, instead of manually operated. The ability to operate a switch electrically instead of manually offers all sorts of automation opportunities.

In addition, a very small voltage can be used to control a large voltage, or a small current can be used to control a large current. The coil that triggers or controls the relay contacts is electrically separate from the switch contacts themselves.

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