Junior Scientist Graphite Resistance(Multicolor)

Do - It - Yourself Kit To Learn How Graphite, A Semiconductor Of Electricity Can Work As Resistor.HOW IT WORKS On connecting the battery with the battery snap and allowing the metal rod to touch the graphite of pencil you will observe that bulb glows brightly. Then by dragging the metal rod away from the slide of the clip you would observe that the glow of the bulb decreases consequently, it became faint and at last the glow disappears. On connecting the metal rod with graphite the bulb glows because the circuit gets completed. Graphite, which is a non metal, it is a good conductor of electricity. When the metal rod comes into contact of graphite the circuit gets completed and thus the bulb glows. Graphite here works as resistor. Resistor opposes the flow of current. IT is in the direction opposite to that of electric current. So as you move the metal rod the resistance increases due to which the flow of current decreases. Thus the glow of the bulb becomes fainter and fainter and at last it disappears.