![](http://uploads.cdn.yaclass.in/upload/pumpa/img_4.png)
PUMPA - SMART LEARNING
எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்
Book Free DemoHome-made switch:
Materials required:
Two drawing pins, a safety pin (or a paper clip), two wires and a small sheet of thermo Col or a wooden board.
Procedure:
- Insert a drawing pin into the ring at one end of the safety pin and fix it on the thermo Col sheet as shown in figure.
- Make sure that the safety pin can be rotated freely.
- Now, fix the other drawing pin on the thermo Col sheet in a way that the free end of the safety pin can touch it.
- The safety pin fixed in this way would be your switch in this activity.
![switch off.jpg](https://resources.cdn.yaclass.in/a6107531-e417-4597-8b97-06e215755763/switchoffw400.jpg)
Switch
Now, make a circuit by connecting an electric cell and a bulb with this switch as shown in figure. Rotate the safety pin so that its free end touches the other drawing pin.
![YCIND_220726_4143_1.png](https://resources.cdn.yaclass.in/275f0b12-0262-4d6f-a82c-cb63a781cb28/YCIND22072641431w500.png)
Circuit arrangement
What do you observe?
When the safety pin touches the free end, the bulb .
Now, move the safety pin away. Does the bulb continue to glow?
.