What happened when electricity flows through an object

  Electrons move slowly through the object.

Explanation:

Electrons move slowly through the object ''1 mm per hour'' following random paths as they bounce off atoms and other electrons. This joggling of electrons propagates through the object ''at speeds approaching that of light'' producing an electric current, as well as causing resistive heating of the object and a magnetic field around the object.

a electromagnetic waves

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

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