does the amp head actually make sound?

like if i bought a head that was 100watts does that mean the head makes a sound of 100watts?

ive been getting pretty confused,
you MUST buy a speaker cabinet of some sort
"every prince has to slay a few dragons before he meets his princess"
The amp is rated to provide 100 Watts of power to a speaker cabinet, so the cabinet should be rated at 100 W power handling as well. (NOTE* NEVER OPERATE A TUBE AMP WITHOUT A SPEAKER (LOAD) ATTACHED OR YOU RISK SEVERELY DAMAGING IT.)
Moving on.....
at the moment im using a 100watt solid state, if i bought a head, could i run through that for a while before buying a cab?