How much does an electron weigh?
How long do you think it will take to fix the electric piano?
Mom bought me a microwave oven.
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.