|MLA Citation:||Bloomfield, Louis A. "Question 1201"|
How Everything Works 20 Oct 2017. 20 Oct 2017 <http://howeverythingworks.org/print1.php?QNum=1201>.
What matters then is just how much charge enters the appliance. The open switch would normally block the passage of electricity, which is why the appliance doesn't operate while it's turned off. But as charge accumulates on one side of the switch, the voltage at that point rises higher and higher. When the voltage becomes high enough, as it easily does after a lightning strike, the charges can leap into the air and travel to the other side of the switch even though the two sides don't touch one another. Another view of this disaster is that the like charges on one side of the switch repel one another so vigorously that some of them are pushed through the air to the other side of the switch. As a result of this movement of charges through the air—an electric arc—current passes through the appliance as though it were turned on. If this current exceeds what the appliance can tolerate, the appliance will be destroyed. Even grounding the appliance may not help—charges can flow uncontrollably through the appliance and, while some charges take paths to ground, others flow through sensitive components and destroy them.