potential different

The amount of electrical energy converted into heat energy is 2.0 J when a current of 0.4 a flows through a wire for 10 seconds.
What is the potential different across the wire? 
Jumlah tenaga elektrik yang ditukarkan kepada tenaga haba elektrik yang ditukarkan kepada tenaga haba ialah 2.0 J apabila arus 0.4 A mengalir melalui wayar selama 10 saat.
Berapakah beza keupayaan merentasi wayar?

A 0.5 V
B 0.8 V
C 4.0 V
D 8.0 V

Meaning:

Potential difference: The energy transferred by a coulomb a charge that moves through the two points.

V=E/Q @ E=VQ

Electrical energy: The ability of the electri current to do work

E=Pt

E=VIt

E=(V²t)/R

E=I²Rt

Power: Rate of energy transferred

P=IV

P=I²R

P=(V²)/R

Answer : A