Create a circuit using an electromagnetic relay so that pressing BS1 (switch 1) activates the electromagnetic relay and turns on the white lamp, and releasing BS1 (switch 1) turns off the white lamp.
Key point
The electromagnetic relay has a coil and four contacts. When 100 V AC is applied to Nos. 13 and 14, the coil is excited and the contacts are switched all at once. When the current to the coil is cut off, the contacts return to their original position. In this way, a contact being conducted when the coil is excited is called a-contact. Conversely, a contact being conducted when the coil is not excited is called b-contact.
Question
Create a circuit using an electromagnetic relay so that pressing BS1 (switch 1) activates the electromagnetic relay and turns on the white lamp, and releasing BS1 (switch 1) turns off the white lamp.
Key point
The electromagnetic relay has a coil and four contacts. When 100 V AC is applied to Nos. 13 and 14, the coil is excited and the contacts are switched all at once. When the current to the coil is cut off, the contacts return to their original position. In this way, a contact being conducted when the coil is excited is called a-contact. Conversely, a contact being conducted when the coil is not excited is called b-contact.
Devices to use