"Recall simple experiments to distinguish between electrolytes and non-electrolytes"?

in the one we did in chem 1110, we had a light bulb connected to two copper electrodes. When you dip the electrodes in a strong acid aqueous solution, the light burned bright. In a weak acid aqueous solution, it barely lit up. In a non-electrolyte solution, it didn't light at all. If you do it that way, you have to use deionized water in your solutions to ensure accurate results. Tap water could possibly have enough ions in it to make it a weak electrolyte.