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Calculate the current in a circuit whose electromotive force is

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"Ohm's law (named for nineteenth century German physicist George Simon Ohm, who derived it) is an equation describing the fundamental relationship between voltage, current, and resistance. It is usually stated as: E = IR, or V=IR, where E or V = voltage, in volts. E stands for "electromotive force" which is the same thing as voltage, and I = current, in amps, and R = resistance, in ohms."

Derived from the formula above: E=IR, they give you the formula E/R=I (where E=voltage, R=resistance, and I=current in amps).

Substitution:   E/R = 100/5 = 20 amps

Choice D.