Have replacements available. Store the solutions in clearly labeled, covered containers. Activity sheet should include columns for recording the names of liquids tested, student predictions, and observations. Students predict if the liquids will or will not conduct electricity. Prediction is recorded.
Circuit tester is made using teacher's tester as model.
Each tumbler is labeled with the name of one liquid. At least 3 cm of one liquid is poured into the correct tumbler. The clips of the tester are put into each tumbler at equal depth and equal distance apart. Observations are recorded. Testing liquids will need some guidance from the teacher.