Linked from
The 98 pages that link to Electric field, each with the reason it gives.
Maxwell's equationsNarrower topic: It is one of the two fields whose behavior the equations govern.
CapacitorNarrower topic: The separated charges store energy in this field.
TransistorNarrower topic: A gate's electric field controls the channel in a field-effect transistor.
PermittivityNarrower topic: It is the field that permittivity relates to electric displacement.
Electrical breakdownNarrower topic: Its local strength, rather than voltage alone, drives breakdown.