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The unit volt is dimensionally joules per coulomb (Energy / Charge). For a give amount of electric charge, higher voltage means more energy.

The unit electron volt (eV) has the dimension of energy: 1 Volt times the charge on 1 electron.

Answer

Electrons don't transfer energy in a circuit. If you think about it, it should be obvious. In the case of d.c., electrons move so slowly that they couldn't possibly be transferring energy from the supply to the load. In the case a a.c., they are continually moving backward and forward, so cannot transfer energy from the supply to the load. Energy is transferred by a combination of the electric and magnetic fields, probably by means of the 'Poynting field', which is external to the conductors.

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