{"id":36,"date":"2017-11-10T17:24:04","date_gmt":"2017-11-10T17:24:04","guid":{"rendered":"http:\/\/demo.precisethemes.com\/envy-blog-pro\/?p=36"},"modified":"2019-02-23T16:22:17","modified_gmt":"2019-02-23T14:22:17","slug":"making-a-circuit-using-a-relay-1","status":"publish","type":"post","link":"https:\/\/dcaclab.com\/blog\/making-a-circuit-using-a-relay-1\/","title":{"rendered":"MAKING A CIRCUIT USING A RELAY"},"content":{"rendered":"
    \n
  1. INTRODUCTION<\/strong>
    \nAn electromagnetic relay in its switching principle is a mechanical switch which is operated with a low-power DC voltage. The switch part is used to control high power circuits.<\/li>\n
  2. SPDT Relay<\/strong>Relay design
    \n\"\"\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0\"\"The SPDT relay is mainly made up of :<\/strong>1. Movable armature
    \n2.\u00a0Control coil
    \n3.\u00a0Switch contact points
    \n4.\u00a0Coil terminals
    \n5.\u00a0Common terminal<\/p>\n

    Description<\/strong><\/p>\n

    RELAY SPDT (single pole double throw) has a total of five terminals Out of these two are the coil terminals. A common terminal is also included which connects to either of two others. When a voltage is applied to the control circuit, the coil traversed by a current will create an electromagnetic field; this latter is capable of moving a metal element called movable armature.<\/li>\n

  3. Experimentation<\/strong><\/strong>*.Objective:
    \nMake circuit by using a relay<\/a> in the DCAClab simulator.*. Equipment:<\/p>\n
      \n
    • Battery (Electromotive Force E = 1.5 v , Internal resistance r = 1 \u03a9)<\/li>\n
    • Switch K1<\/sub><\/li>\n
    • Coil (r1 = 1\u03a9)<\/li>\n
    • Relay Switch<\/li>\n
    • Lamp (r2<\/sub>\u00a0= 1\u03a9)<\/li>\n
    • Fan<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n

      *.\u00a0Experiment 1: order a single circuit<\/strong><\/p>\n

        \n
      • Experimental mounting
        \n\"\"<\/li>\n
      • Interpretation\n
          \n
        • Level 1
          \n1st<\/sup>\u00a0case: Relay at rest
          \nThe switch K1<\/sub>\u00a0open ( I1<\/sub>\u00a0= 0\u00a0 ) \u21d2K2<\/sub>\u00a0at the position (1), consequently\u00a0 the circuit B is open\u00a0: I2<\/sub>\u00a0= O , so the lamp L is off .
          \n<\/u>2nd<\/sup>\u00a0case: Relay at work
          \nThe switch K1<\/sub>\u00a0is closed ( I1<\/sub>\u00a0\u2260 0 )\u21d2K2\u00a0<\/sub>at the position (2), consequently\u00a0 the circuit B is close\u00a0: I2<\/sub>\u00a0\u2260 0 , so the lamp L is on .<\/li>\n
        • Level 2<\/u><\/u>_ calculating the intensity of the current I1<\/sub>:Ohm\u2019s law: Ue1\u00a0<\/sub>= r1<\/sub>\u00a0I1\u00a0<\/sub>= E \u2013 r I1
          \n<\/sub>So\u00a0\u00a0I1<\/sub>\u00a0\u00a0= E\/ (r1 \u00a0+ r) \u00a0= 0.04838A \u2248 48.38 mA<\/p>\n

          \u00a0<\/sub><\/p>\n

          _ calculating the power P1<\/sub>:<\/p>\n

          P1<\/sub>\u00a0= E I1<\/sub>\u00a0= 1.5 x 0.04838 = 0.07257 w<\/p>\n

          _ Value of the intensity I2<\/sub>:<\/p>\n

          By using the characteristics of the lamp we find I2<\/sub>\u00a0= 1.456 A<\/p>\n

          _ calculating the power P2<\/sub>:<\/p>\n

          P2<\/sub>\u00a0= E I2<\/sub>\u00a0= 1.5 x 1.456 = 2.184 w<\/p>\n

          Conclusion:<\/p>\n

          The relay can be used to control a high power circuit by a low power circuit.<\/li>\n<\/ul>\n<\/li>\n

        • Experimental verification using the DCAClab simulator
          \n\"\"<\/li>\n<\/ul>\n

          *. Experiment 2\u00a0: order 2 circuits\u00a0<\/strong><\/p>\n

            \n
          • Experimental mounting1st<\/sup>\u00a0case: Relay at rest<\/strong>The switch K1 is open \u21d2K2 at the position (1), consequently:\n
              \n
            • The circuit B is closed, so the lamp is on.<\/li>\n
            • The circuit C is open, so the fan is off.<\/li>\n<\/ul>\n<\/li>\n
            • Experimental verification using the DCAClab simulator
              \n\"\"
              \n2nd<\/sup>\u00a0case\u00a0: Relay at work<\/strong>The switch K1<\/sub>\u00a0is closed\u21d2K2\u00a0at the position (2) , consequently\u00a0 :<\/p>\n
                \n
              • The circuit B is open, so the lamp is off.<\/li>\n
              • The circuit C is closed, so the fan is on.<\/li>\n<\/ul>\n<\/li>\n
              • Experimental verification using the DCAClab simulator
                \n\"\"<\/li>\n<\/ul>\n

                the end.<\/p>\n","protected":false},"excerpt":{"rendered":"

                An electromagnetic relay in its switching principle is a mechanical switch which is operated with a low-power DC voltage. The switch part is used to control high power circuits.<\/p>\n","protected":false},"author":1,"featured_media":163,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"footnotes":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false,"jetpack_publicize_feature_enabled":true},"categories":[19],"tags":[],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/dcaclab.com\/blog\/wp-content\/uploads\/2017\/10\/Screen_Shot_2017-11-10_at_7.48.17_PM.png?fit=169%2C139&ssl=1","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p9HmdS-A","jetpack_likes_enabled":true,"jetpack-related-posts":[{"id":3877,"url":"https:\/\/dcaclab.com\/blog\/how-to-use-relay-in-lab\/","url_meta":{"origin":36,"position":0},"title":"How to use Relay in LAB","date":"April 3, 2018","format":false,"excerpt":"A relay is a switch operated electrically which consist of an electromagnet in order to operate the switching operation manually inside the relay. 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