Question
Describe the following experiment with Diagram : To construct an electric switch in an electric circuit.
✓
Answer
Apparatus - Materials: Two drawing pins, a safety pin, two wires and a small sheet of thermocol.
Procedure: Procedure:
$(1)$ Take a safety pin and a drawing pin.
$(2)$ Insert a drawing pin into the ring at one end of the safety pin and fix it on the thermocol sheet.
$(3)$ Make sure that the safety pin can be rotated freely.
$(4)$ Now, fix the other drawing pin on the thermocol sheet in such a way that the free end of the safety pin can touch it. The safety pin fixed in this way would be your switch.
$(5)$ Now, make a circuit by connecting an electric cell and a bulb with this switch as shown in Figure $(b)$.
$(6)$ Rotate the safety pin so that its free end touches the other drawing pin. Observe the bulb.
$(7)$ Now, move the safety pin away. Does the bulb continue to glow? Observation and Understanding: When the safety pin touches both the drawing pins, it fills the gaps between them and completes the circuit. This condition is called ‘switch on’. When the free end of the safety pin is removed away from the drawing pm, the circuit becomes discontinuous arid the condition is known as ‘switch off’. Conclusion : A switch is used to turn on or turn off bulb or other electric equipments.
Procedure: Procedure:
$(1)$ Take a safety pin and a drawing pin.
$(2)$ Insert a drawing pin into the ring at one end of the safety pin and fix it on the thermocol sheet.
$(3)$ Make sure that the safety pin can be rotated freely.
$(4)$ Now, fix the other drawing pin on the thermocol sheet in such a way that the free end of the safety pin can touch it. The safety pin fixed in this way would be your switch.
$(5)$ Now, make a circuit by connecting an electric cell and a bulb with this switch as shown in Figure $(b)$.
$(6)$ Rotate the safety pin so that its free end touches the other drawing pin. Observe the bulb.
$(7)$ Now, move the safety pin away. Does the bulb continue to glow? Observation and Understanding: When the safety pin touches both the drawing pins, it fills the gaps between them and completes the circuit. This condition is called ‘switch on’. When the free end of the safety pin is removed away from the drawing pm, the circuit becomes discontinuous arid the condition is known as ‘switch off’. Conclusion : A switch is used to turn on or turn off bulb or other electric equipments.
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