A neutron star is . a star made mostly of elements with high atomic mass numbers, so that they have lots of neutrons the remains of a star that died in a massive star supernova (if no black hole was created) the remains of a star that died by expelling its outer layers in a planetary nebula an object that will ultimately become a black hole

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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.

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