contact arm การใช้

• Note that the nc ( normally closed ) contact arm is a spring that is slightly deflected in the rest state.
• Each tram car was then fitted with a bell connected to a special contact arm to warn the driver if a stud remained live after it had passed.
• One form of rotary switch consists of a spindle or " rotor " that has a contact arm or " spoke " which projects from its surface like a cam.
• Like other typical rotary switches, the single terminal connects to one of the multiple terminals by rotating a contact arm, sometimes called a wiper, to the desired position.
• A contact arm could be moved up and down to select one of ten rows of contacts, and then rotated to select one of ten contacts in that row, a total of 100 choices.