electricity
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電 centers on electricity: the invisible force that powers modern life, often associated with lightning and rapid energy.
telephone call; phone call
train; electric train
electron
electricity
generation of electricity; power generation
electric power
charging (electrically)
source of electricity; electrical power
radio wave; reception; signal
battery; cell
household (electrical) appliances; home appliances; consumer electronics
electrically powered; electric
power outage; power failure; power cut; blackout
electric shock
voltage
electric current
electric light
light bulb
electric line; electric cable; power cable
electrification
electrical machinery; appliances
transmission of electricity; electricity supply; power supply
electric railway
last train (of the day)
電 combines 雨 (rain) with a simplified form of 申 (to extend), suggesting lightning extending through rain clouds. The modern form uses 田 with a tail, a simplification of the older component.
Rain 雨 falls from the top, and the lower part looks like a lightning bolt striking a field 田 with a tail. Together, 電 is the electricity in a storm.
For デン, imagine a den full of electric eels: den -> デン, and the eels spark with electricity like the kanji 電.