a transformer has an output of 24v when supplying a current of 2A. The current in the primary coil is 0.40A and the transformer is 100% efficient. Calculate the power output of the transformer

Hey hope you get the answer but i suck at math sorry : (

This is what a calorimeter is used for simpler ex, to measure calories in food.

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.