electric from fruits

yellow food fruit lighting plant green vegetable measuring voltage voltmeter serial connected electrical sources lemon battery electric fruits acidic-electrolyte amper anode battery battery-types bio-battery bio-cell capacity cathode chemical-reaction chemistry copper copper-electrode digital education electric-current electrical electricity electrolyte energy-source energy-storing experiment ions laboratory laboratory-experiment lemon lime-battery lemon-cells measurement measuring-instrument multimeter physics renewable school-experiment school-laboratory sulfuric-acid voltage voltmeter zinc zinc-electrode zinc-metal 1-5volt 1-5volts alternative current dc electrode energy serial-connection one-and-a-half-volts