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Bird on a Wire

One of the most frequent questions that I heard during my years of presenting my Watt is Electricity program was, "How can a bird sit on a powerline without being electrocuted?"


Lightning in clouds
A normal lightning strike to the ground is the result of the attraction between the negatively charged cloud and the positive charge on the ground below. What causes lightning to strike from one negatively charged cloud to another?


When I was growing up, lighters made a spark by rubbing a metal wheel across a flint (which was not really made out of flint.) Lighters like this one ignite the flame in a different way. How is the gas ignited?