Here's a step-by-step guide to the candle power science experiment.
2 thick candles
2 leads with alligator clips
Stick a nail into each of the candles, about halfway down. Don't let them come out the other side.
Take the magnet and rub it against the surface of each of the nails to magnetise them.
Use the alligator clips to attach one lead to one candle, and the other lead to the other candle so that both leads have a free alligator clip.
Now you can power something small that uses batteries like a bulb from a torch. Simply attach the bulb to each of the spare end alligator clips and light your candles.
The candle experiment is a popular experiment in science classes all over the world, and is a fun & easy to set up experiment.