Electron
Electronic
noun
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.
でんし
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.
電子のおもさはいくらですか？
How much does an electron weigh?
その電子ピアノを直すのに、どれくらい時間がかかると思いますか？
How long do you think it will take to fix the electric piano?
母親が電子レンジを買ってくれました。
Mom bought me a microwave oven.