The moon has a diameter of 3.48 x 106 m and is a distance of 3.85 x 108 m from the earth. the sun has a diameter of 1.39 x 109 m and is 1.50 x 1011 m from the earth. determine (in radians) the angles subtended by (a) the moon and (b) the sun, as measured by a person standing on the earth. (c) determine the ratio of the apparent circular area of the moon to the apparent circular area of the sun. these calculations determine whether a total eclipse of the sun is really "total."

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.