(physics) conduction band; a range of electron energies in an insulator or semiconductor in which electrons can move freely and transport charge.

realm, territory, occupied area / field (area of expertise) / (mathematics) domain

to conduct

conduction

electron / (attributive) the quality of being electronic

freedom, liberty / (rare) demand (for goods or services) / (euphemistic) a toilet, a restroom

obi - the sash worn with a kimono / paper wrapper (on books, CD, etc.)

省エネルギー: energy saving (abbr. 省エネ)

energy

band, belt