Tense, bluesy, and commanding. Wants to resolve to the tonic.
The F# Dominant 7th chord (F#7) is built on the root note F# with component pitches F#, A#, C#, E. Formula: [0 - 4 - 7 - 10 semitones]. Category: Dominant 7th (4 tones). Primary genres: Blues, Jazz, Rock and Roll, Funk.
Notes in this chord: F# - A# - C# - E
Use as the V chord to create a strong pull back to your I chord.