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Simple Kids Crafts is a video blog dedicated to reviving the old art of handicrafts for people of all ages. How do oil spills affect aquatic plants? A Miniature Solar Panel Fire Water Balloon Make Clouds in a Bottle Secret Messages Make a Rocket Make a Hovercraft Make an Anemometer Make a Sundial Make a Radio Make an Electroscope Make a Stethoscope Make a Telescope Make a Periscope Make a Camera Bending a stream of water with a comb Lighting a bulb without electricity Simple Motor Cotton Ball Rocks? Salt-Absorbing Art and Science Color Changing Glue Art Baking Soda Clay Oil Sun Catcher Grow a Pineapple Plant! Bead Bowls Wow, what an Air-Gun Funny Diver ! Water boils without fire Ice with Boiling Water Water that boils instantly Water boils in a Paper Pot Soap-driven Boat Pulse Moves Pin Pretty Garden—without Plants Picture made by Fire Magic Pictures Dancing Doll Smoke Goes Down The Dancing Coupl The Umbrella Dance Magic Butterfly Colorful

A Rheostat


Purpose

To prove that electrical current decreases as resistance increases, and to build an instrument that will test this-a rheostat.

Materials

A large square battery and two short lengths of wire (probably from a hardware store), a small light bulb and socket, a knife, and a lead pencil.

Experiment

Cut the wood away from a lead pencil until you have exposed about two inches of the lead. Connect one side of the miniature socket with its bulb to one pole of the battery. Strip the ends of the loose wires so that they are no longer insulated. Press the two exposed ends to the lead. If the ends are close together, the bulb will light. As the distance between the two ends is increased, the light intensity decreases. 

Why does this happen?

**Lead is a very poor conductor, a resistor, and as the resistance is increased, the current decreases.

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