Which is a source of AC current?

A) heating the ball in boiling water
B) running the ball over a strong magnet
C) rubbing the ball back and forth on carpet
D) dropping the ball from a tall bulding

Wavelength divides in half and speed stays the same.

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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Answermuscle strength;