How much does an electron weigh?
How long do you think it will take to fix the electric piano?
The Tyrannosaurus Rex was shocked with 10,000 electron volts.
An electricity child. What is a really small part of electricity? What makes up electricity? That would be the electron. This word can also refer to things that are electronic as well.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.