American Heart Association
American Heart Association: Getting Healty: Nutrition Center: Potassium
Learn about potassium and why the mineral is important to our health.
Other
Nephrology Channel: Electrolyte Imbalance
In addition to defining "Electrolyte," and providing examples, this website describes hypotremia, "The most common electrolyte imbalance associated with kidney disease."
WebMD
Web Md: Electrolytes and Electrolyte Imbalances
What are electrolytes? What do electrolytes do? Find simple answers to these questions in the two paragraphs provided on this website.