I'm doing an investigation at school involving lemon batteries, and today's pre-trials were a disaster. I couldn't get a reading from the lemon battery using a Voltmeter, Microammeter and Multimeter (electronic ammenter and voltmeter). I also need to substitute the lemon for a lime, grapefruit and orange, and if I can only get a small reading from the lemon then I will be lucky to get any reading from the other fruits.
I'm fairly sure I did everything right, so this baffles me. Can anybody offer some help?