Electricity circuts

We used 12 batteries in this one 

We used 12 batteries 

                                                               I think this we used 6 batteries

Today for science we made light bulbs. We used pencil leads, a jar, pie tin, positive and negative wires, eight D size batteries and tape. First we got out the batteries and taped them into twos. We attached the  wires and tried a whole lot of different leads. The first one we used was the hard kind. It exploded. The next was soft and one lit up and broke. We kept experimenting and I think it was when we used twelve batteries to power a 4B lead. Here's some pictures of most of the attempts.