Quote:
Originally Posted by BB_TX
Current passing thru a wire creates an electromagnetic field (EMF) around that wire. The greater the current the stronger the field. And that EMF can create a voltage potential on any adjacent metal close enough. That is the working principle of a transformer. A basic transformer has two wire windings that are not electrically connected to each other. Applying a voltage to the primary winding causes current to flow thru that winding. That current creates an EMF around that wire winding. That EMF causes a potential voltage on the secondary winding. And if something is connected to that secondary winding, current will flow thru it.
I suspect a helicopter that near a high voltage line carrying a lot of current could actually develop a potential voltage on the metal frame of the helicopter. Connecting a wire between the helicopter and the power line ensures that potential voltage doesn’t develop.
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Thanks Bill. That sounds reasonable.
Lynwood