Yes. The amp, like a TV, DVD-player, or even a radio will use up some power when they're in standby mode.
The game you are playing in with the host is tied to their account. So if they leave, then you will not be able to play on their game without them there.
No, you cannot leave the US without a passport.
No, you cannot leave the country without a passport.
No, you cannot leave the country without a passport.
Taking leave without permission is commonly referred to as "unauthorized absence" or "absent without leave (AWOL)." It is a violation of workplace or military policies and can result in disciplinary action.
AOL Absent WithOut Leave unauthorized leave
If you stay on the bridge nothing will happen unless you are playing online where your other teammates will leave on the helicopter without you
absent Absent WithOut Leave = A.W.O.L.
Leave without pay (LWOP)
Energy is a conserved quantity. That means that, if no energy enters or leaves an object, the total energy of this object will remain the same. There are several ways for energy to enter or leave; I am not sure whether all of these qualify as "work".
No, geothermal energy has no waste.
Maternity leave, bereavement leave, sick leave, vacation leave, leave without pay, etc.