an eletric press consumes 120KJ of energy in 5 minutes, when the magnitude of current flowing through it is 2A. calculate the electric potential at which press operates.

Power = joules/second (watts)(120,000 joules/5 minutes) x (minute/60 seconds) = 400 wattsPower dissipated by a component in an electrical circuit = (current through it) x (potential difference across it).400 watts = (2 amperes) x VV = 400 watts / 2 amperes = 200 voltsNote: That's the potential DIFFERENCE between the terminals of the machine,NOT the "potential at which it operates".