101 Science Experiments by Illa Podendorf

By Illa Podendorf

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Some look like this. 44 45 2. How can a bell be connected with two dry cells so that it will ring? Use cotton-covered copper wire. Connect two dry cells together. Be sure you connect a positive terminal and a negative one. This is important because electricity goes from the positive to the negative. The positive terminal is in the middle and the negative one is on the outside. Connect a wire to a switch and to one of the terminals of one of the dry cells. Connect a wire to the other terminal on the other dry cell.

N o w cut the wire b e t w e e n the switch a n d dry cell a n d you will have a b r o k e n circuit even when the switch is closed. Use a cork to represent a fuse. Place two small nails a b o u t V2 inch a p a r t in the cork. W r a p one of the loose wires a r o u n d one nail a n d the other loose wire a r o u n d the other. Now you place a very thin piece of iron pict u r e wire from one nail to a n o t h e r allowing it to touch t h e copper wire which is a r o u n d the nails. T h e picture wire must be t h i n n e r t h a n t h e c o p p e r wire.

How are electric magnets made to work? 36 Find an iron stove bolt a b o u t two inches long. Be sure the bolt is iron because your electric m a g n e t will not work if it is steel. Measure off about 6 yards of cotton covered copper wire 24 gauge. W r a p the iron bolt tightly with paper and tape the paper in place. Start w r a p p i n g the wire on the bolt by beginning at the nut end. Leave about one foot of wire at the end so there will be some for connections. W h e n you have reached the other end of the bolt, t u r n it around and keep on wrapping.

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