to construct an electric switch in an electric circuit.
Apparatus- Materials :
procedure :
Answers
Aim: To make an electric switch (adult supervision required)
Materials needed: Three pieces of wire about 10 cm each, a safety pin, two board pins, a piece of cardboard, a pencil cell, a sharp blade, and a small torch bulb
procedure
1. Take the piece of cardboard and place the safety pin on it.
2. Strip the ends of the three pieces of wire so that about 1 cm of the metal wire is exposed.
3. Attach a piece of wire to a drawing pin. Push the drawing pin through the end loop of the safety pin into the cardboard.
4. Attach the second piece of wire to the second drawing pin. Push the drawing pin into the cardboard, about 1 cm away from the first drawing pin. Make sure that the safety pin held in place by one drawing pin can be turned to touch the other pin. Now your switch is ready.
5. Do you want to test the switch? Connect the free end of one of the wires to one terminal of the pencil cell. Connect the third wire to the other terminal of cell and to the bulb.
6. Connect the free wire from the switch to the other side of the bulb.
7. Turn the safety pin such that it touches both the drawing pins.
observation
The bulb glows when the safety pin is turned such that it touches both the drawing pins.
hope its help u
Apparatus Materials : Two drawing pins , safety par in , two wires , thermocol sheet.
Procedure : 1. Insert a drawing pin into the ring at one end of the safety pin and fix it on the thermocol sheet as shown in figure.
2. Make sure that, the safety pin can be rotated freely.
3. Now , fix the other drawing pin on the thermocol sheet in a way that the free end of the safety pin can touch it.
4. The safety pin fixed in this way would be your switch here.
5. Now , make a circut by connecting an electric cell and bulb with this switch as shown in figure.
6. Now , rotate the safety pin so that its free end touches the other drawing pin.
7. Now move the safety pin away.
Observation and Understanding : When we touch the safety pin touches the other drawing pin , then the position the switch is said to be "on" , hence the bulb glows. On the other hand , the bulb did not glow , when the safety pin was not in touch with other drawing pin .
Conclusion : The circuit was not complete a there was a gap between the drawing pins , so in that position , the switch is said to be off and bulb will not glow.