The wire gets so hot that it burns the air in the bottle. The wire breaks and the lamp goes out. You will have to use more picture frame wire each time you want to do the demonstration. Have an electric lamp ready to show the students. To print out the Student Copy only, click here .
Procedure Do in groups of two to three students.
Have the students use the equipment at their station to make an electrical tester. If students need a hint tell them that two ends of two different wires will not attach to anything. Have them draw and label their electrical tester before they construct it. Once they have constructed their tester, they should begin to test all objects in the bag and record on data sheet. To print out the Data Sheet only, click here .