NUSA8ET: These Tone Pairs (Labelled A

NUSA8ET An electrical contact is an electrical circuit component found in electrical switches, relays, connectors and circuit breakers. Each contact is a piece of electrically conductive material, typically metal. When the contacts touch, the switch is closed; when the contacts are separated, the switch is open. The gap must be an insulating medium, such as air, vacuum, oil, SF6. Contacts may be operated by humans in push-buttons and switches, by mechanical pressure in sensors or machine cams, and electromechanically in relays.|{3|4|5|6|7|8|9|10|Three|Four|Five|Six|Seven|Eight|Nine|Ten} Questions {You need to|It is advisable|It is advisable to|It's essential|It's essential to|It's good to|It's worthwhile to|That you must|You could|You have to|You might want to|You must|You should|You want to|You'll want to} Ask About Slot A