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Why Lightning Can Destroy Your Electronics

Illustration of a man surprised by thunder outside and smoke coming out of his computer
cause
Lightning damage caused insulation breakdown in the windings of the coil
used in the computer's internal power supply.
 Image of a power supply board burned and blackened by lightning.
consideration
When a sudden, large current flows through the coil,
a high voltage is generated across both ends of the winding.
important point 
Coils that may be subject to external surges require some kind of overvoltage protection.
best way
 For coils that may be subject to external surges,
it is recommended to create a discharge gap,
as shown in the photo below, using a board pattern.
An image of the back of a power supply circuit board explaining how to prevent damage from lightning.

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