a cylindrical tungsten filament 16.0 cm long with a diameter of 1.20 mm is to be used in a machine for which the temperature will range from room temperature (20 ∘c) up to 120 ∘c. it will carry a current of 12.0 a at all temperatures ( resistivity of tungsten at 20 ∘c is 5.25×10−8ω⋅m , the temperature coefficient of resistivity at 20 ∘c is 0.0045 ∘c−1 )

stands for electromotive force and it is measured in volts. despite its name, it is not actually the force in the sense of being a "pushing" or "pulling" (not measured in newtons).an equation that relates emf,  ℰ,  to a battery's terminal voltage, v, current, i, and internal resistance, r, is    ℰ = v + irin this case, the emf can be interpreted as a voltage—a difference in electric potential.i would not say that it would be considered an energy. if emf can be defined as the energy/work per a unit charge from a battery or other electric source, then it is not strictly energy.