Materials Needed:
Two drawing pins,A safety pin (or paper clip),Two pieces of insulated wire},A small piece of cardboard
→ Take the small piece of cardboard. This will serve as the base for your switch.
→ Make sure the cardboard is dry and clean.
→ Push one of the drawing pins through the loop or head of the safety pin.
→ Insert this drawing pin into the cardboard.
→ Ensure the safety pin can rotate freely around the drawing pin. This will be the movable part of your switch.
→ Place the second drawing pin a short distance away from the first one on the cardboard.
→ Position it so that the free end of the safety pin can touch this drawing pin when rotated.
→ Push the second drawing pin firmly into the cardboard.
→ Take the two pieces of insulated wire.Wrap one end of the first wire around the first drawing pin (the one with the safety pin).
→ Wrap one end of the second wire around the second drawing pin.
→ Make sure the wire makes good contact with the metal of the drawing pins.
→ Now, switch is ready to be tested.
→ Connect the free ends of the wires into a circuit with a battery and a light bulb.
→ When the safety pin is touching the second drawing pin, the circuit is complete, and the bulb should light up.
→ When the safety pin is not touching the second drawing pin, the circuit is open, and the bulb should not light up.