In practice, darkness, various weather conditions, maintenance, and the angle of the Sun limit the production of each photovoltaic cell to about 15% efficiency. Assuming the photovoltaic cells you are using to power your cabin operate at 15% efficiency, how many would you need to meet your electrical needs

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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.