Test the conduction of electricity through various fruits and vegetables.
Vegetables-Potato,onion and tomatoes. best veg conductor is tomato.
Fruits-apples,grape,orange. The citrus fruits will be excellent conductors due, again, to the high acidity level. Acidic or Citrus fruits are best to conduct or even generate electricity. Acid in the fruits reacts with water and generates Hydrogen which is in ionic form and is positively charged (it lacks electrons).