Construct a pencil rheostat as shown in the figure. Arrange a science corner to exhibit a model using this to show the factors affecting the resistance of a conductor and to explain Ohm’s Law.
Make a channel on the sole of a slipper so as to place three cells. Remove the wooden insulation from half the pencil length wise so that the graphite can be seen. Fix a bulb holder and the pencil on the sole using glue. Then arrange clips, safety pin, cells and bulb as shown in the figure.
The explain part is that when we connect the other wire to the near end of pencil (which is connected which other wire) the bulb grows brighter than we move away the wire to the far end. This works with the principle that resistance is directly proportional to length.
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