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Mechanically and electrically, a relay is a generic term for a part of a machine which uses a small force to actuate a larger one.
A relay is an electronic switching device that opens or closes a circuit. An electromechanical relay would be one that is opereated remotely using an electrical circuit that mechanically operated the relay, which in turn opens/closes the second ciruit.
Relay is an electrically driven switch. It is an electromagnet to perform switching mechanically but other type of switches are also available. It is employed when a circuit is required to be controlled with a low input signal.
BUZZER IS SIMPLY A RELAY THAT MECHANICALLY OPENS AND CLOSES. A speaker is a coil suspended into a magnetic flux responding to AC signals
Southern advantages: 1. Higher morale 2. Greater skilled generals 3. Invasion of the north (plundering of resources) Northern advantages: 1. Well equipped 2. Greater numbers 3. Defending home soil
Its a circuit, the advantages are that they help start cars and other automobiles.
The Union.
I assume you mean via remote. There is a solenoid on the trunk release that when activated by a relay pulls the release. The key when turned mechanically pulls the release.
Mechanically
to be honest mechanically secure is
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As of 14 Aug 2008, the world record for women's Olympic 4x200 meter freestyle relay is 7:44.31 held by Team Australia. The previous record was held by USA in 2007 of about 7:49