Learners test solutions of water, sugar, salt, and hydrochloric acid for electrical conductivity. They immerse leads from a lighting device (a battery pack connected to an LED) into each solution. If the solution conducts electricity, the light turns on. Learners discover that only certain substances (those with dissolved ions) conduct electricity. Original operating guide (using a fan instead of a light, and a hand-cranked generator instead of a battery) with original title "Just Charge It" is included. This activity is currently used in the Nature of Matter Unit in OMSI's Chemistry Lab. Cost estimates are per 100 learners. For safety reasons, this activity should be conducted as a demonstration for younger learners.