A teacher divides her class into groups and assigns each group the task of measuring the length of the same object three times. The teacher already knows that the length of the object is 78.5 mm. Based on the results the students record, which group makes the most accurate measurements of the object? A. Group D: 75.0 mm, 75.0 mm, 75.0 mm B. Group B: 75.5 mm, 75.0 mm, 74.8 mm C. Group C: 78.5 mm, 72.9 mm, 79.8 mm D. Group A: 78.5 mm, 77.5 mm, 79.5 mm

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.