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Electrons move through an electric circuit in wire. The repulsion of the electrons at one end of the wire and their attraction at the opposite end of the wire results in the electrons moving in one direction. Prepare a poster to explain the movement of electrons away from the negative end and toward the positive end of the wire. Show Time! Connecting only a single foil strip from the battery to the bulb will not light it. html 31/10/2004 Document Página 1 de 1 Page 39 Switch leading from one end of the battery to the other is necessary for the electrons to flow through and cause the bulb to light.

Use a legend showing that each car represents a single electron and that each size highway indicates a wire gauge. Use your information about wire gauges when comparing highways to wire gauges. Check It Out! The cup of salt contains many individual grains of salt. Instead of counting each grain and determining the flow rate in number of salt grains per unit of time, a larger unit of measurement (cups or ml) was used. Coulomb is a unit used to express a large quantity of electric charges. A current of 1 amp is equal to 1 coulomb of charges per second flowing past a given point.

Using two separate 18-gauge wires and alligator clips, connect one wire to the paper clip in the first lemon and the second wire to the penny in the second lemon. Touch the free ends of these two wires to the battery contacts on the watch. To observe the face of the watch, stand it on its side and place a mirror in front of it. Check It Out! In 1792, Alessandro Volta, a professor of physics at the University of Pavia, Italy, discovered that chemical action between two metals could produce electricity.

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