This is a webpage for my science final. Hi Ms. Nelson! Here I’m going to talk about open and closed circuits. Above is twin pictures of open and closed dry-cell battery circuits. Both ends of a battery are connected by a wire with a lightbulb in between. On the left is a closed circuit and as you can see, everything is connected and the lightblub is lit up. Ths process begins in the dry-cell battery when a chemical reaction occurs. This only happens when there is a complete circit and the wire is connected. The negitve electrons, or charges travel from the moist paste in the battery, out of the negitive terminal, around the wire, through the light blub, into the positive termnal on the other side and into the carbon rod in the center of the battery where he charges meet up with positive ones of the same kind. The lightblub lights up because of the negitive charges charges passing through. The lightbulb has a special kind of wire in the center called tungsen hat has a high resistance. Resistance is the mesure of how easy it is for electrons to pass through a material. It is measured in ohms. Tungsten has such high resistance that as the electrons pass through, they emit a glow, due to their slow pace. That is how a closed circuit. On the right is an open circuit. As you can see, the wire is not connected and therefore is not a complete circuit. the light blub is not lit up because there is no chemical reaction to send the electrons arund the wire. |
